David's BJJ training began in 1993 with Nick Sanzo. He then started the first BJJ club at UMass Amherst in 1996. Since then he has had the opportunity to train with many amazing Professors such as Tony Torres-Aponte (Urban Jungle, 2001), Doug Vaughn (Elite MMA, 2004), and with Eddie Avelar (GroundDwellers, 2009). He has served as a police officer for nearly 20 years notably as a Defensive Tactics and Patrol Tactics Instructor. In addition to serving as an Instructor for his department he also travels the world, namely in Ukraine, training the National Patrol Police.