Born in Maassluis, Koffeman worked for several years as a campaign strategist for the Socialist Party. Among his accomplishments was the creation of their current logo. In addition to his political work, he has been active in several animal rights organizations. He has also worked as a broadcast director. He later played a key role in the creation of the Party for Animals. He is a eurosceptic.
- (in Dutch) Parlement.com biography
- Je bent voor, of je bent tegen NCR.NL, Jaco Alberts and Cees Banning. March 10, 2007
- De BV Dierenleed de Volkskrant, Jean-Pierre Geelen. December 15, 2007
- "Antoinette Hertsenberg Biography". IMDb. Retrieved 2019-04-15.
- "Veganism is on the rise, but experts say the cons of the diet outweigh the pros". The Independent. Retrieved 2019-04-15.