Montrose Madison Wolf, PhD (May 29, 1935, Houston, Texas — March 19, 2004, Lawrence, Kansas) was an American psychologist. He developed the technique of "time-out" as a learning tool to shape behavior in children in the 1960s. He was a leader in creating the discipline of problem-solving, real-world psychological research known as applied behavior analysis. He created the Teaching Family Model as an intervention program for dealing with juvenile delinquents. He helped replicated this model almost 800 times.