Dr. Ad Vingerhoets is a clinical psychologist who focuses on stress and emotion. Currently, he is a Professor in the Department of Medical and Clinical Psychology and the Center of Research on Psychology in Somatic Diseases at Tilburg University. He has spent more than 20 years studying when and why we cry, and how the study of crying may help us obtain better insight into human nature. Vingerhoets has written more than 300 articles in journals and books and has edited or authored 18 books.