Gerhard Hugo Hirth occupies the position of Chairman of Ohorongo Cement Pty Ltd., Co-Managing Director at Schwenk Donau GmbH & Co. KG and Managing Director at Schwenk Geschäftsführungs GmbH. Mr. Hirth is also on the board of PAUL HARTMANN AG, Wieland-Werke AG, Raysut Cement Co. SAOG and Köster Holding AG.

He previously was Co-Managing Director at SCHWENK Zement KG.