The Rheingold institute for qualitative market and media research
was founded in 1987 in Cologne, Germany
, by Stephan Gruenewald and Jens Loenneker. The Rheingold method is based on the psychological theory of morphology
, developed in the 1950's by Dr. Wilhelm Salber, a former professor and institute director at the University of Cologne.
Rheingold currently has six managing partners and 60 employees.