Pentti Hakkarainen (other)
Pentti Hakkarainen may refer to one of the following: * Pentti Ensio Hakkarainen Pentti E. Hakkarainen (1944 – June 1, 2021) was a Lithuanian educational psychologist of Finnish origin. Education and career He graduated from the University of Jyväskylä in 1967, where he went on to obtain a master's degree and then a Ph. ...