Most recently, he advised and sold concentrates for Cehave-Landbouwbelang in Germany. He has also worked in Germany as a technical sales advisor for dairy cows and dairy goat producers at Hendrix UTD (a Nutreco company).
Roost has several years experience managing dairy farms in Europe and the United States.
Roost received his Dipl.Agr.Ing degree from the agricultural university in Den Bosch. Currently he resides in Belgium with his wife and family.