Dr. Deyle Appears in NBC Show "Who Do You Think You Are?" Dr. Steven Deyle recently appeared in an episode of the NBC show "Who Do You Think You Are?" examining the family history of the former Dallas Cowboy running back Emmitt Smith. Each episode of the show examines the ancestry of a famous American in moving and sometimes painful ways. An excerpt featuring Emmitt Smith and Dr. Deyle can be viewed on NBC.com. A member of the University of Houston History Department, Dr. Deyle is an expert on 19th century American history, especially slavery and the Old South. The Department of History faculty congratulates Dr. Deyle on his latest accomplishment