At 19, Mark joined Onramper and established the SMB subscription responsible for more than 20% of its monthly revenue. Nine months later, MoonPay acquired Onramper for $15m. He then quit and, in four months, wrote two handbooks (about 200 pages each) explaining David Deutsch’s books, which were endorsed by David, Naval Ravikant, and others. Inspired by Scott Young finishing the MIT computer science bachelor’s in one year, he then spent a year and a half on similar self-study in computer science, machine learning, and technical AI safety. He finally landed on strategy and fieldbuilding as his main focus areas.