Stephen D. Chubb has been Special Limited Partner of Catalyst Healthcare Ventures, a venture investment firm specializing in medical devices and diagnostic products, since June 2010. Previously, Mr. Chubb served as President and Chief Executive Officer of Allegro Diagnostics, Inc., a privately held molecular diagnostics company focused on the development and future sale of innovative genomic tests for the diagnosis, staging and guided treatment of lung cancer and lung diseases, from September 2010 through March 2011. Mr. Chubb was previously Chairman and Chief Executive Officer of Matritech, Inc., a publicly traded leading developer of proteomics-based diagnostic products for the early detection of cancer, from its inception in 1987 until December 2007. Mr. Chubb served as President and Chief Executive Officer of T Cell Sciences, Inc. and as President and Chief Executive Officer of Cytogen Corp., both publicly traded biotechnology companies. Mr. Chubb served as Chairman of the Board of Trustees of Mount Auburn Hospital in Cambridge, Massachusetts from 2006 to 2010 and was concurrently a director of Caregroup Healthcare System. He is currently a director of Allegro Diagnostics Corp. and Immunetics, Inc. Mr. Chubb has been a director since 1994.

 He is specialized in medical devices and diagnostic products. He also focus on the development and future sale of innovative genomic tests.