Other interests

Martial arts

Black Belt in Korean martial art Tang Soo Do; Moo Duk Kwan (Federation Number: D-10-2107; Black Belt Number: 11-SE388; Instructor: Grand Master Jino Kim, Dan 8), Dan 1: 3 September 2011; Dan 2: 8 March 2014; Dan 3: 9 September 2017. Photo (3 November 2017). I trained at Professional Karate Schools of America (PKSA) in Ann Arbor, Michigan from 2006-2010, and at J. Kim Martial Arts in Columbus, Ohio from 2010-2018.

Music (especially jazz and progressive rock)

I have some professional musician friends, listed (alphabetically) below. Michiel Borstlap, Steve Hackett, and Patrick Moraz have written blurbs for my social psychology textbook with Roy Baumeister.

Han Bennink (percussion). Listen to him on NPR Fresh Air.

Michiel Borstlap (keyboardist). Listen to excerpts from Concertbebouw concert.

Ernst Glerum (bass). Listen to him with pianist Ruben Hein.

Steve Hackett (guitarist Genesis). Listen to Spectral Mornings.

Patrick Moraz (keyboardist Yes, Moody Blues). Listen to excerpts from Princeton concert.

Traveling (especially in Europe)

I have taught courses, given lectures, and conducted research with colleagues in Belgium, France, Germany, Hungary, Italy, Luxembourg, The Netherlands, Poland, Poland, Romania, Spain, Switzerland, and the U.K. Each year I teach an intensive 1-week course on meta-analysis at the University of Luxembourg.

Vegetarian cuisine (eating and cooking)

I have been a vegetarian since age 18.


I love cycling, especially in The Netherlands. If the weather in Columbus is good, I also like to ride my bike to work at The Ohio State University (about 6 miles or 10 km). If the weather is bad, I like to ride a stationary bike at home.


I took a yoga class as an undergraduate student, and have loved it since then. Research shows that yoga is also an effective means of reducing anger and aggression.