Jonathan Lewis, M.D., Ph.D.
Chief Executive Officer and Executive Chairman, ZIOPHARM Oncology, Inc.

                                                                                                                                                                                                                               
Dr. Lewis is Chief Executive Officer and a Director, serving in these capacities at ZIOPHARM Oncology, Inc. since January 2004.  From July 1994 until June 2001, Dr. Lewis served as Professor of Surgery and Medicine at Memorial Sloan-Kettering Cancer Center.  He has been actively involved in leading translational and clinical research in cancer, and is widely recognized by patient advocacy groups.  He has received numerous honors and awards in medicine and science, including the ASCO Young Investigator Award, the Yale University Ohse Award, and the Royal College of Surgeons Trubshaw Medal.  He served as Chief Medical Officer and Chairman of the Medical Board at Antigenics, Inc. from June 2000 until November 2003.  He serves as a Director on the Board of Delcath Systems, Inc. (Nasdaq: DCTH) and of POPPA (the Police Organization Providing Peer Assistance) of the New York Police Department (NYPD).  He also serves on the Medical Advisory Board of the Sarcoma Foundation of America.