At the end of the 1950s, he met the advertisers
Karl Gerstner and and became their partner in 1962. The agency then traded as Gerstner, Gredinger, Kutter, or GGK. After Gerstner and Kutter retired in 1975, Gredinger took over their shares and expanded the agency into a European network with up to 20 branches. In the 1970s and 1980s, Gredinger's company was regarded as a first address for top creative professionals. Gredinger himself was the protagonist of one of the first colour ad campaigns
I drink Jägermeister because... by
Jägermeister. Gredinger supported his artist friends such as
Dieter Roth,
André Thomkins and
Donald Judd. In 1990, he sold his shares to the Swiss
Trimedia. Gredinger was elected honorary member for Germany by the
Art Directors Club of New York in 1992. Gredinger was brought to
ETH Zurich in 1999 by the then guest lecturer,
Valerio Olgiati, as a fictitious client, for whom one of the residential buildings was designed by
Raphael Zuber. == Personal life ==