Founder of Rallybio LLC, Martin W. MacKay is an American businessperson who has been at the head of 7 different companies and presently occupies the position of Chief Executive Officer & Director at Rallybio LLC, Chief Executive Officer & Director at Rallybio Holdings LLC (a subsidiary of Rallybio LLC) and Chief Executive Officer at Calyx Group Ltd. (Ireland). Martin W. MacKay is also on the board of Charles River Laboratories International, Inc., Charles River Laboratories, Inc., Novo Nordisk An and 5:01 Acquisition Corp.

In his past career Dr. MacKay held the position of Chief Executive Officer & Director at Neverfail, Inc. and Chief Executive Officer & Director at Neverfail Group Ltd. (a subsidiary of Neverfail, Inc.), Global Head-Research & Development at Alexion Pharmaceuticals, Inc., Vice President-International at VeriSign, Inc., President-Research & Development at AstraZeneca Plc, Principal at PeopleSoft USA, Inc., Senior Vice President-Worldwide Development at Pfizer Inc. and President of Pfizer (St. Louis) (a subsidiary of Pfizer Inc.), Principal at Beecham Pharmaceuticals (UK), Chief Executive Officer of Vecta Software Corp. Ltd., Operations Director for Dun & Bradstreet Corp., Head-Drug Preformulation & Delivery at Basf Performance Products Ltd. (United Kingdom), Head-Molecular & Cell Biology at CRI Worldwide LLC, Principal at Accenture LLC, Director-Business Development for NorthgateArinso, Inc. and Head-Drug Preformulation & Delivery at Ciba-Geigy Pharmaceuticals.

Martin W. MacKay received an undergraduate degree from Heriot-Watt University and a doctorate from The University of Edinburgh.