Mark Rober

Mark B. Rober 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 Based in USA, Mark Rober is best known as engineer-turned-science creator, with a combined following of roughly 78M across 3 tracked platforms.

Mark Rober built an audience by posting consistently in the education space and turning one format into a habit for fans. Youtube is the biggest home for that audience today at about 70M followers, and growth on the other platforms followed the same content being cut for each feed. Exact milestone dates vary between sources, so treat the timeline here as an outline rather than an official record.

Expect education and tech content: the recurring formats that made the channel recognisable, collaborations with other creators in the same niche, and short-form cuts made for TikTok, Reels and Shorts. Posting in English keeps the core audience in USA, while subtitles and visual formats pull in viewers worldwide.

Like most creators at this scale, Mark Rober earns through platform revenue, sponsorships and brand partnerships, with merchandise or own-brand products layered on top. Public deal terms are rarely disclosed, so we list only ventures that have been reported publicly and avoid guessing at contract values.

Published net-worth figures for Mark Rober come from third-party estimate sites, not audited accounts, and they disagree with each other by a wide margin. What can be said with confidence is that a following of about 78M supports meaningful income from Youtube alone, before brand work and business ventures. We do not publish a single number we cannot source.