Mark studied to become a biomedical engineer at the University of Cincinnati but dropped out of college because it was too stressful for him. Mark's father passed away after a year long battle with lung cancer on July 4, 2008, when Mark was 19, which caused him to become very depressed. However, he knows some basic Korean courtesy of his mother. He has attempted to speak Portuguese and other languages, but as per usual, it ended horribly.

He is half-Korean from his mother and half-German from his father, but despite his background, he is only fluent in English. Mark was born in the Tripler Army Medical Center on Honolulu, O'ahu, Hawaii, and was raised in Cincinnati, Ohio. True to their word, they deleted the channel at midnight on November 14, 2020. They promised to delete it after one year, hence the name being 'One Year' in Latin. On November 15, 2019, Markiplier and Ethan revealed a channel named Unus Annus. His full-toned voice, in-depth style of gameplay, commentary, and multiple charitable acts have spanned a highly successful YouTube career.

He mainly uploads playthroughs of various video games, most notably horror games such as Neverending Nightmares, Amnesia: The Dark Descent, SCP – Containment Breach, and Five Nights at Freddy's.

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