HARA Junsuke is a Japanese sociologist and Professor Emeritus at Tohoku University. He specializes in sociology, mathematical sociology and behavioral science. He graduated from the Department of Sociology, Faculty of Letters, University of Tokyo, and after serving as Associate Professor at Yokohama National University and as Professor at Tokyo Metropolitan University, he took up a professorial position at Tohoku University in 1994. He also served as Dean of the Graduate School of Letters at Tohoku University. He retired from Tohoku University in 2009. His work focused on the social stratification and inequality of Japanese society.