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Executive Officers

Jack Lief
Co-Founder, Chairman, President and Chief Executive Officer

Dominic P. Behan, Ph.D.
Co-Founder, Director,
Senior Vice President and Chief Scientific Officer

Robert E. Hoffman
Vice President, Finance and Chief Financial Officer

William R. Shanahan, Jr., M.D., J.D.
Senior Vice President and Chief Medical Officer

Steven W. Spector
Senior Vice President, General Counsel and Secretary

Jack Lief

Co-Founder, Chairman, President and CEO

Jack Lief is a co-founder of Arena and has served as a director and our President and Chief Executive Officer since April 1997. Mr. Lief has also served as the Chairman of our Board of Directors since October 2007. Mr. Lief served as an advisor and consultant to numerous biopharmaceutical organizations from 1995 to April 1997; as Senior Vice President, Corporate Development and Secretary of Cephalon, Inc., a biopharmaceutical company, from 1989 to 1994; as Director of Business Development and Strategic Planning for Alpha Therapeutic Corporation, a manufacturer of biological products, from 1983 to 1989; and in various positions at Abbott Laboratories, a pharmaceutical company, from 1972 to 1983, most recently as the head of International Marketing Research. Mr. Lief serves as the Chairman of the board of directors of ADVENTRX Pharmaceuticals, Inc., a company focused on pharmaceuticals for cancer and infectious disease. Mr. Lief is also an Executive Board Member of BIOCOM, a life science association representing approximately 550 member companies in Southern California, and was the Chairman of the board of directors of BIOCOM from March 2005 to March 2006. Mr. Lief holds a B.A. from Rutgers University and an M.S. in Psychology (Experimental and Neurobiology) from Lehigh University.