Gregory Stevens, Ph.D, M.H.S., is a Professor of Public Health at California State University Los Angeles. He is a health policy researcher, writer, teacher, and advocate. He holds an M.H.S. and Ph.D. from the Johns Hopkins University Bloomberg School of Public Health. He is an author of the book Vulnerable Populations in the United States and serves as a co-Editor of a health care policy blog at the journal Medical Care.