Gertjan has been a butcher all his life. Recently he took up the role of head butcher at Driessen Food in Bunnik. Alongside that he teaches classes on leading chef training courses and makes meat videos for foodtube and YouTube.
He wrote the book The Meat Bible of which more than 21,000 copies have been sold, and writes columns for Saltmines, Meat Magazine and Gastronomie. He is also known from TV where he has worked on several different programmes. Gertjan has a fondness for Ireland and its meat. In his limited spare time, he participates in KCBS BBQ competitions throughout Europe.