Mark Edward Fischbach ( / ˈfɪʃˌbɑːk / FISH-bahk; born June 28, 1989), known online as Markiplier, is an American YouTuber and film director. [2] He mainly uploads Let's Plays and is known for his videos of indie horror games. [3] After joining YouTube in 2012, Fischbach became popular on the platform with Let's Plays of.