Mark Edward Fischbach (born June 28, 1989) is a popular vlogging and gaming YouTuber known by his username, Markiplier. He primarily uploads playthroughs of various video games, most notably horror games, such as Neverending Nightmares, Amnesia: The Dark Descent, SCP – Containment Breach, Five Nights at Freddy's, and many others.

Mark was born in Oahu, Hawaii, and was raised in Cincinnati, Ohio. He is half-Korean from his mother and half-German from his father, but despite his background he is only fluent in English. He has attempted to speak Portuguese and other languages, but as per usual, it ends horribly. He knows some basic Korean courtesy of his mother, but very little.

Mark's father passed away (after a long battle with cancer) when Mark was 17, which led him to become very depressed. Mark studied to become a biomedical engineer at the University of Cincinnati, but dropped out of college to pursue his YouTube career.

Mark often hosts monthly charity livestreams (almost all of which are on a Saturday around the middle of the month) in which he raises money to donate to charities like the Cincinnati Children's Hospital. He and his community have raised $1,118,645.14 in total and the number grows with every livestream.

He currently resides in Los Angeles, California.