He's a professional comedy writer, Vine star, stand-up comic, and comedic actor. Nash's TBS bio describes his comedy career as: Jason has been doing comedy for 17 years. The Boston native started as Norm MacDonald's assistant at Saturday Night Live before moving on to write for MTV. Jason started using Vine to promote his movie. He posts Vine videos daily to his 713,000 followers. Jason specializes in dark comedy inspired by his life as a husband, father and struggling comedian. (Instagram)