Michael Louis Friendly (born 1945) is an American-Canadian psychologist, Professor of Psychology at York University in Ontario, Canada, and director of its Statistical Consulting Service, especially known for his contributions to graphical methods for categorical and multivariate data, and on the history of data and information visualisation.

[1][2] Born in New York City, Friendly obtained his BS in 1966 from the Rensselaer Polytechnic Institute, and his MS in 1969 from Princeton University.

In 1971/2 he also obtained his PhD in psychology at Princeton under supervision of Harold Gulliksen and Peter Ornstein, with the thesis titled "Proximity Analysis and the Structure of Organization in Free Recall.

"[3][4] Friendly's first research project in the field of psychometrics and cognitive psychology had started at the Educational Testing Service and Princeton University, and was made possible by a Psychometric Fellowship awarded by the Educational Testing Service.

After graduation Friendly jointed the Department of Psychology at the York University in Ontario, Canada, where he continued his research.