Donald O. Clifton

Donald O. Clifton (February 5, 1924 – September 14, 2003) was an American psychologist, educator, author, researcher, and entrepreneur. He founded Selection Research, Inc., which later acquired Gallup Inc., where he became chairman, and developed CliftonStrengths, Gallup's online psychological assessment. Clifton was recognized with a presidential commendation from the American Psychological Association as "the father of strengths-based psychology and the grandfather of positive psychology".