Brett Clifford Gelman (born October 6, 1976) is an American actor and comedian. He is best known for his role as Murray Bauman in Netflix 's horror-supernatural series Stranger Things and as Martin in the BBC comedy Fleabag. Gelman began his career as a comedian in the 2000s, gaining notability the following decade for his involvement in numerous Adult Swim shows, notably Eagleheart and comedy specials in 2014 and 2015. During this time, he also was part of the main casts of the NBC sitcom Go On, the Comedy Central series Another Period, and the FX comedy series Married. Gelman became prominent in the late 2010s for his supporting roles in ()