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Gregory R. Johnson, Ph.D., has served as a director since October 1994. Currently, Dr. Johnson is a Managing Director of Prolog Ventures, LLC, a life sciences focused venture capital management firm based in St. Louis. Dr. Johnson organized Prolog in 2000 following 13 years as a General Partner with Gateway Associates. Prior to joining Gateway, Dr. Johnson served as Vice President of Monsanto Venture Capital Company. Dr. Johnson is currently a director of Everest Biomedical Instruments Company, Singulex, Kereos, Akermin and EraGen BioSciences, Inc. Dr. Johnson received a Ph.D. and M.A. in Physics from the University of Rochester and a B.S. in Physics from the Massachusetts Institute of Technology | 