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John began his career at D.E. Shaw & Co, where he rose to Managing Director. While at D. E. Shaw, he directed the firmā€™s Japanese equity and equity-linked investments and supervised the firmā€™s London investment management affiliate. Following D.E. Shaw and before starting Two Sigma, John spent two years at Amazon.com, first serving as Vice President and technical assistant to Amazon.com founder Jeff Bezos. He went on to lead customer relationship management at Amazon.com, directing Amazonā€™s renowned personalization, community, and targeted marketing features and technology. He also led critical efforts to make Amazonā€™s customer technology more scalable.

A lifelong math enthusiast, John won a silver medal for the United States in the 27th International Mathematics Olympiad. He earned a B.S. in Mathematics (with distinction) and a M.S. in Statistics from Stanford University.

As President of Overdeck Family Foundation, Johnā€™s philanthropy is focused on enhancing education to improve academic and socioemotional outcomes for children across the country. In addition to supporting his foundation, John also serves on the boards of the Robin Hood Foundation, the Institute for Advanced Study and is the Chair of the National Museum of Mathematics. He also serves on the Board of Directors of the Hamilton Insurance Group.

In 2017, John was honored by the Academy of Achievement for being a pioneer in technology and investment management.