Peter J. Hornsby, Ph.D., is Professor in the Department of Cellular and Integrative Physiology at University of Texas Health Science Center San Antonio. Peter J. Hornsby works on cellular aging and tissue engineering. His main scientific interest and focus of work is regenerative medicine. He also serve as the Co-Director of the San Antonio Nathan Shock Center and as Co-Leader of the Research Career Development Core of the San Antonio Older Americans Independence Center (Pepper Center). His teaching activities focus on gastrointestinal physiology, both within the Medical School and the Graduate School.