Kelly David Brownell (born October 31, 1951) is a clinical psychologist and scholar of public health and public policy at Duke University whose work focuses on obesity and food policy. He is a former dean of Duke's Sanford School of Public Policy. Noted for his research dealing primarily with obesity prevention, as well as the intersection of behavior, environment, and health with public policy, Brownell advised former First Lady Michelle Obama's initiatives to address childhood obesity and has testified before Congress. He is credited with coining the term "yo-yo dieting", and was named as one of "The World's 100 Most Influential People" by Time Magazine in 2006. Source: Wikipedia (en)