2020 - ResearchHub is helping accelerate the pace of scientific research.
2019 - I signed the GivingPledge.
2018 - GiveCrypto.org - a non-profit that is financially empowering people by distributing cryptocurrency globally.
2012 - Coinbase - helping create an open financial system for the world.
2004 - UniversityTutor - a free online directory of tutors, acquired in 2014.