Mark Sargent

Mark Kendall Sargent was born and raised on Whidbey Island, Washington, and attended Western Washington University before being expelled for manufacturing illegal fireworks to sell while on probation. He subsequently worked for approximately 20 years training corporate clients in proprietary software systems and was a competitive video game player, winning a virtual pinball championship. He has no scientific training of any kind.

In early 2015, Sargent became interested in flat Earth content, primarily through Eric Dubay's materials, and began producing his own YouTube series called 'Flat Earth Clues.' The series, which frames the flat Earth as an 'enclosed system' with a solid dome, attracted millions of views and is widely credited alongside Dubay's work with catalyzing the modern flat Earth revival. By 2018, Sargent's channel had accumulated 10 million views and he had transitioned to being a full-time YouTuber.

Unlike Dubay, Sargent has actively distanced himself from antisemitism and Holocaust denial, and positions himself as a mainstream-friendly face of the flat Earth movement. He describes himself openly as a 'recruiter' for flat Earth beliefs and has spoken at flat Earth conferences in the United States, Canada, and New Zealand. He was the primary subject of the 2018 Netflix documentary 'Behind the Curve,' which followed flat Earth believers and, in one memorable sequence, showed flat Earth experimenters inadvertently producing results consistent with a spherical Earth during their own laser-based experiment.

Sargent's influence stems entirely from his effectiveness as a communicator and community builder, not from any scientific expertise. His model of an enclosed flat Earth has been comprehensively refuted by physics, astronomy, and navigation science. He continues to produce content and appears on flat Earth-oriented podcasts and events, maintaining a community of followers who pay for memberships and merchandise.

“The Earth is a flat disc enclosed in a dome ('firmament'), and stars and planets are lights attached to the dome, not physical objects in space.”

Stellar parallax, the independent confirmation of planetary physics by multiple space agencies from competing nations, the behavior of telescopes, radio astronomy, and direct spacecraft missions all confirm that stars and planets are physical objects at distances measurable through consistent physical methods. The dome/firmament model cannot account for the behavior of GPS, astronomical prediction

“All world governments have been lying about the shape of the planet; NASA faked the Apollo program and all space exploration.”

The Apollo program's results have been independently verified by nations including the Soviet Union — the United States' primary Cold War adversary, which had every incentive to expose a hoax — as well as by modern radio telescope observations of the retroreflectors left on the lunar surface, and by analysis of the lunar samples returned, which have been studied by scientists in dozens of countrie