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Mark Jeffrey is an award-winning serial entrepreneur and author with Harper Collins.

Most recently, Mark co-founded Guardian Circle and the $GUARD token community emergency response network (NEWSWEEK Blockchain Impact Award Nominee (2019), One of FAST COMPANY’s 'World Changing Ideas' (2018); Partner: XPRIZE Foundation; Featured in TRUST MACHINE (2018), THE RISE OF BLOCKCHAIN (2019). He is also an early pioneer of blockchain technology, having published BITCOIN EXPLAINED SIMPLY (2013) and THE CASE FOR BITCOIN (2015). 

His previous companies include The Palace (backed by Time Warner, Intel and SoftBank; sold with 10 million users), ZeroDegrees (a business social network sold to InterActiveCorp / IAC in 2004 with 1 million users) and ThisWeekIn (video network). He was the founding CTO of Mahalo / (backed by Elon Musk, Sequoia and others). 

Mark Jeffrey holds a BS in Computer Science from the University of New Hampshire. On Twitter, he is @markjeffrey.

Mark has been named one of '50 to Watch' by Variety magazine and presented at the very first Harvard Conference on The Internet and Society.

Mark is the author of seven books of fiction, published both traditionally and as audiobooks. His first novel, MAX QUICK: THE POCKET AND THE PENDANT is published by HarperCollins.  Mark was one of the first three people ever to podcast a novel: MAX QUICK originally received over 2.5 million downloads in 2005.

Mark can be reached at mark dot jeffrey at gmail dot com.

Buy ‘Crypto Explained Simply (2019)’ for $19.95 on Vimeo. Trailer:

Crypto Explained Simply (2019) - $19.95