"Current Issues in Psychological Humor Research," International Journal of Humor Research. (Vol 6:1, 1993)
"Measurement of the sense of humor," International Journal of Humor Research. (Vol 9:3/4, 1996)
Guest Editor, Special Issue on "Fearing humor?," Humor: International Journal of Humor Research. (Vol 22:1/2, 2009)
Guest Editor, Special Issue on "Humor und Heiterkeit im Alter" Zeitschrift für Gerontologie und Geriatrie. (2010, co-editor with Prof. Dr. Dr. Rolf Hirsch)
Guest Editor, Special Issue on "Dispositions towards ridicule and being laughed at" Psychological Test and Assessment Modeling (53) (2010, together with R. T. Proyer)
Memberships and Functions in Scientific Organizations
Memberships
International Society for the Study of Individual Differences (ISSID), London, GB (1983 -)
Deutsche Gesellschaft für Psychologie (DGfPs), Göttingen (1984 -)
European Association of Personality Psychology (EAPP), Tilburg, The Netherlands (1985 -)