Brett Gelman is an American actor and comedian who is best known for the roles of Brett Mobley in the Adult Swim comedy-action series Eagleheart, as Mr. K on the NBC sitcom Go On, as Hamish on the Comedy Central series Another Period, and as A.J. in the FX comedy series Married. He co-starred as Martin on the BBC comedy Fleabag (2013) and has appeared on Twin Peaks, Making History, and as Murray Bauman in Stranger Things. In 2014, Gelman hosted a dinner party special called Dinner with Friends with Brett Gelman and Friends, which aired on Adult Swim. In 2017, Gelman starred in and co-wrote Lemon, opposite Judy Greer, Michael Cera, Nia Long and Gillian Jacobs, directed by Janicza Bravo. It had its world premiere at the Sundance Film Festival. He then starred in the independent feature film Room for Rent (2018).