Etan Ilfeld is a London-based entrepreneur and the founder of Tenderbooks, Tenderpixel gallery, Watkins Mind Body Spirit Magazine, Watkins Wisdom Academy, PlayStrategy.org, co-founder of Repeater Books, a venture partner at Remagine Ventures, and the owner and managing director of Watkins Books, Watkins Media, and the Mind Sports Olympiad. Ilfeld is the inventor of Diving chess and the author of Beyond Contemporary Art, co-author of Duchamp versus Einstein and the creator of the Synchronicity Oracle. He is also the host of the Etan Ilfeld Podcast.

Repeater Books is a publishing imprint based in London, founded in 2014 by Tariq Goddard and Mark Fisher, formerly the founders of radical publishers Zero Books, along with Etan Ilfeld, Tamar Shlaim, Alex Niven and Matteo Mandarini. It was launched by Watkins Media.