Dez Maarsen wins Jam 299! Posted on May 19, 2013 by Effraim — Leave Comments ↓ Photo credit: Edwin Baron Photography. Lot of events going on worldwide this weekend! Dez Maarsen won the Jam 299 event over in Groningen, Holland. Congratulations to Dez! Aborigino Sandino Stuart took second place and Erik Hogers third. Hopefully some video soon..