![Friedrich Greten](https://cdn.zonebourse.com/static/resize/768/576//static/images/insiders/unknown.png)
Friedrich Greten
Direktor/Vorstandsmitglied bei Bürgschaftsbank Schleswig-Holstein GmbH
Aktive Beziehungen
Name | Geschlecht | Alter | Unternehmensverbindungen | Zusammenarbeit |
---|---|---|---|---|
Bernd Schmidt | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Peter Voß | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | 7 Jahre |
Werner Möller | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Uwe Polkaehn | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Lars Schöning | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Andreas Steuck | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | 7 Jahre |
Christiane Sorgenfrei | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Joachim Wallmeroth | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Markus Schaly | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Enno Koertke | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Bernd Maier-Staud | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Christian Maaß | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Andreas Katschke | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Björn Ipsen | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Norbert Heinrichs | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Johannes Hartwig | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Heiko Gröpler | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Jan Meyer | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Andreas Jonas | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Michael Fröhlich | M | 64 |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Dieter Staschewski | M | - |
Volksbank-Raiffeisenbank im Kreis Rendsburg eG
![]() Volksbank-Raiffeisenbank im Kreis Rendsburg eG Regional BanksFinance Volksbank-Raiffeisenbank im Kreis Rendsburg eG provides banking and financial services to private and corporate clients. Its products and services include accounts and credit cards, payments processing, savings and investments, loans and home finance, real estate finance, pension and insurance, as well as start-ups and succession planning. The company was founded in 1898 and is headquartered in Osterroenfeld, Germany. | - |
Stefan Witt | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Georg Schäfer | M | - |
Volksbank-Raiffeisenbank im Kreis Rendsburg eG
![]() Volksbank-Raiffeisenbank im Kreis Rendsburg eG Regional BanksFinance Volksbank-Raiffeisenbank im Kreis Rendsburg eG provides banking and financial services to private and corporate clients. Its products and services include accounts and credit cards, payments processing, savings and investments, loans and home finance, real estate finance, pension and insurance, as well as start-ups and succession planning. The company was founded in 1898 and is headquartered in Osterroenfeld, Germany. | - |
Jorn Kick | M | - |
Volksbank-Raiffeisenbank im Kreis Rendsburg eG
![]() Volksbank-Raiffeisenbank im Kreis Rendsburg eG Regional BanksFinance Volksbank-Raiffeisenbank im Kreis Rendsburg eG provides banking and financial services to private and corporate clients. Its products and services include accounts and credit cards, payments processing, savings and investments, loans and home finance, real estate finance, pension and insurance, as well as start-ups and succession planning. The company was founded in 1898 and is headquartered in Osterroenfeld, Germany. | - |
Kai Brüning | M | - |
Volksbank-Raiffeisenbank im Kreis Rendsburg eG
![]() Volksbank-Raiffeisenbank im Kreis Rendsburg eG Regional BanksFinance Volksbank-Raiffeisenbank im Kreis Rendsburg eG provides banking and financial services to private and corporate clients. Its products and services include accounts and credit cards, payments processing, savings and investments, loans and home finance, real estate finance, pension and insurance, as well as start-ups and succession planning. The company was founded in 1898 and is headquartered in Osterroenfeld, Germany. | - |
Jan Brüdern | M | - |
Volksbank-Raiffeisenbank im Kreis Rendsburg eG
![]() Volksbank-Raiffeisenbank im Kreis Rendsburg eG Regional BanksFinance Volksbank-Raiffeisenbank im Kreis Rendsburg eG provides banking and financial services to private and corporate clients. Its products and services include accounts and credit cards, payments processing, savings and investments, loans and home finance, real estate finance, pension and insurance, as well as start-ups and succession planning. The company was founded in 1898 and is headquartered in Osterroenfeld, Germany. | - |
Jens Hartmann | M | - |
Volksbank-Raiffeisenbank im Kreis Rendsburg eG
![]() Volksbank-Raiffeisenbank im Kreis Rendsburg eG Regional BanksFinance Volksbank-Raiffeisenbank im Kreis Rendsburg eG provides banking and financial services to private and corporate clients. Its products and services include accounts and credit cards, payments processing, savings and investments, loans and home finance, real estate finance, pension and insurance, as well as start-ups and succession planning. The company was founded in 1898 and is headquartered in Osterroenfeld, Germany. | - |
Kay Heinrich Sachau | M | - |
Volksbank-Raiffeisenbank im Kreis Rendsburg eG
![]() Volksbank-Raiffeisenbank im Kreis Rendsburg eG Regional BanksFinance Volksbank-Raiffeisenbank im Kreis Rendsburg eG provides banking and financial services to private and corporate clients. Its products and services include accounts and credit cards, payments processing, savings and investments, loans and home finance, real estate finance, pension and insurance, as well as start-ups and succession planning. The company was founded in 1898 and is headquartered in Osterroenfeld, Germany. | - |
Ulf Struve | M | - |
Volksbank-Raiffeisenbank im Kreis Rendsburg eG
![]() Volksbank-Raiffeisenbank im Kreis Rendsburg eG Regional BanksFinance Volksbank-Raiffeisenbank im Kreis Rendsburg eG provides banking and financial services to private and corporate clients. Its products and services include accounts and credit cards, payments processing, savings and investments, loans and home finance, real estate finance, pension and insurance, as well as start-ups and succession planning. The company was founded in 1898 and is headquartered in Osterroenfeld, Germany. | - |
Johannes Grützner | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Kirsten Suhr | F | - |
Volksbank-Raiffeisenbank im Kreis Rendsburg eG
![]() Volksbank-Raiffeisenbank im Kreis Rendsburg eG Regional BanksFinance Volksbank-Raiffeisenbank im Kreis Rendsburg eG provides banking and financial services to private and corporate clients. Its products and services include accounts and credit cards, payments processing, savings and investments, loans and home finance, real estate finance, pension and insurance, as well as start-ups and succession planning. The company was founded in 1898 and is headquartered in Osterroenfeld, Germany. | - |
Kurt-Christoph von Knobelsdorff | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Holger Eschholz | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Ulrich Wachholtz | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Achim Thöle | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Udo Hansen | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Dirk Dejewski | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Herbert Ewers | M | - |
Bürgschaftsbank Schleswig-Holstein GmbH
![]() Bürgschaftsbank Schleswig-Holstein GmbH Savings BanksFinance Bürgschaftsbank Schleswig-Holstein GmbH is a German company that provides financing solutions to medium-sized companies in Schleswig-Holstein. The private company is based in Kiel, Germany. The company offers tailor-made financing solutions with default guarantees and participation capital, and they check their customers' projects for feasibility. The company also supports consultants in optimal financing for their clients and offer services to chambers and associations. The company provides additional security to banking partners, which ensures scope for financing. The company was founded in 1949, and the CEO is Hans-Peter Petersen. | - |
Beziehungs-Chart
Beziehungen zu mehreren Unternehmen
Statistik
Land | Beziehungen | % des Gesamten |
---|---|---|
Deutschland | 38 | 100,00% |
Alter der Beziehungen
Aktive
Vergangene
Herr
Frau
Aufsichtsräte
Führungskräfte
Ursprung der Beziehungen
- Börse
- Insiders
- Friedrich Greten
- Persönliches Netzwerk