Mark B. Rober is an American YouTuber, engineer, and inventor. He is known for his YouTube videos on popular science and do-it-yourself gadgets. Before YouTube, Rober was an engineer with NASA for 9 years where he spent seven of those years working on the Curiosity rover at NASA's Jet Propulsion Laboratory. He later worked for four years at Apple Inc. as a product designer in their Special Projects Group, where he authored patents involving virtual reality in self-driving cars.