Dr. Menno A. Mennes first revealed the fundamentals of his Model of Motivation in his dissertation published in 2016. He graduated cum laude at Utrecht University, The Netherlands, in clinical psychology. After several years in education, he spent most of his career doing research on motivation in Europe, the US and Asia. Until his recent retirement, he was program director at the Honours Academy of Leiden University, The Netherlands. Details of his findings appear in the Series on Motivation, at Amsterdam University Press.