Karen A. Dawes Elected as Repligen Co-chairperson of the Board of Directors

Repligen Corporation RGEN announced today that Ms. Karen A. Dawes has been elected to serve as co-chairperson of the Board of Directors along with Mr. Alexander Rich, M.D. Ms. Dawes has served as a Director of Repligen since September of 2005 and has extensive experience in the pharmaceutical and biotechnology industry in the development of worldwide marketing and sales teams and commercialization strategies. “Karen's commercial expertise, strategic vision and leadership skills have been a highly valuable resource to our Company,” stated Walter C. Herlihy, President and Chief Executive Officer of Repligen Corporation. “I am very pleased to have Karen and Alex share the leadership of our Board as we continue to transition from a development stage organization to an integrated company with commercial, manufacturing and product development capabilities.”