Mark B. Rober (born March 11, 1980) is an American YouTuber, engineer, inventor, and educator. He is known for his YouTube videos on popular science and do-it-yourself gadgets. Before he became a YouTuber, Rober was an engineer with NASA for nine years, where he spent seven years working on the Curiosity rover at NASA's Jet Propulsion Laboratory. He later worked for four years at Apple as a product designer in their Special Projects Group, where he authored patents involving virtual reality in self-driving cars.