Todd Risley

Todd Robert Risley (September 8, 1937 – November 2, 2007) was an American psychologist. He is credited with helping to create the field of applied behavior analysis, and has been described as a "pioneer" in this field. He is known for the study he conducted with Betty Hart, who was his graduate student at the University of Kansas at the time, on the word gap between rich and poor children. He was also a co-founder and editor-in-chief of the Journal of Applied Behavior Analysis.