Stefan Flothmann studied biology from 1983 to 1990 at the Universities of Düsseldorf and Kiel in Germany, monitoring programs and specialising in environmental impact assessments, marine and fisheries biology. In 1991 he changed his area of interest to aquaculture until he joined Greenpeace in 1993. There he started working as oceans campaigner and changed to genetic engineering in 1997, first as team leader and later as head of the department. Since October 1999, he has also been part of the Senior Management Team of Greenpeace Germany.

Since 1997 he has been actively involved in public campaigning on genetic engineering focussing on the issues genetic engineering in agriculture and food but also on patenting of life. As head of the department he is responsible for the political direction of the organization1s campaigning. He has also represented Greenpeace International at conferences, including Symposia of the Codex Alimentarius.