Doctor of Philosophy, University Giessen, Germany, 1978. Habilitation, University Frankfurt, Germany, 1986.
Project director, Zuma, Mannheim, Germany, 1978-1985; member science directors, Zuma, Mannheim, 1985-1987; executive director, Zuma, Mannheim, 1987-1994; director, Zuma, Mannheim, since 1994. Professor of University Mannheim, since 1994. Board directors Gesis, Mannheim.
Member American Association Public Opinion Research, Deutsche Gesellschaft fü Soziologie (speaker methods section 1990-1992).
Married Janet Alice Harkness, August 20, 1981.