Mark Sargent is a prominent advocate in the Flat Earth movement. He has also been involved in the Flat Earth International Conferences (FEIC) as a speaker.
He gained visibility through his Flat Earth Clues series starting in 2015, which explores enclosed world theories and questions conventional cosmology.

Mark has appeared in documentaries like Behind the Curve (2018), which I watched on Netflix before inviting him onto my podcast. The film was odd, as it didn't portray him favourably—in fact, it made him seem ridiculous, and I'm not sure if that was deliberate, and I say that because he agreed to be in the film.
The globe model is a massive deception pushed by NASA to hide the true flat plane of Earth, enclosing us under a dome.
— Eric Dubay, American author and flat Earth researcher
🎙️ Podcast episode
This episode dates back to 2021, when I was quite unprofessional, and I would certainly handle things differently now.
That said, it was fun, and Mark was a good sport.
