Director since 2006. Dr. Harris has been President and Chief Executive Officer of Vesalius Ventures, a Houston-based venture capital firm, since June 2001. He has also been the Managing Director of The Space Agency, a marketing agency, since 2001. Dr. Harris served as Vice President for Space Media, Inc., from 1999 to 2001, where he established an international space education program. Since 1998, Dr. Harris has also been President of PBI, Inc., an investment firm. He is the founder and President of the Harris Foundation, which supports math and science education for youths. Dr. Harris is a director of U.S. Physical Therapy, Inc., a public company that is subject to the reporting requirements of the Exchange Act.