Peter is CEO of GroupM Austria since 2007 and also Chairman of the Board of GroupM Switzerland since 2011. The GroupM is the parent company of the media agencies Maxus, MEC, MediaCom, Mindshare.

Moreover, he is vicepresident of AGMA, an association of approximately 230 of the most important companies in the advertising and media industry with the aim of exploring mass communication. He is also president of IGMA, an interest group of media agencies. Peter found MediaCom in 1987 and he was managing director of MediaCom until 2006.