Mark Jeffrey is a serial entrepreneur and author with Harper Collins. Most recently, Mark founded the Guardian Circle community emergency response network. He is 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 SoftBank, Intel and Time Warner; sold to Communities.com wit...
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Mark Jeffrey is a serial entrepreneur and author with Harper Collins. Most recently, Mark founded the Guardian Circle community emergency response network. He is 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 SoftBank, Intel and Time Warner; sold to Communities.com with 10 million users), ZeroDegrees (a business social network sold to InterActiveCorp in 2004 with 1 million users) and ThisWeekIn (co-founded with comedian Kevin Pollak). He was the founding CTO of Mahalo / Inside.com (backed by Elon Musk, Sequoia and others). Mark also worked with Travis Kalanick (CEO & Founder: UBER) on his first company Red Swoosh.
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