Mark currently serves as the head of tax services at TIAA-CREF, a large financial institution based in New York. Before joining TIAA-CREF, he was a law clerk at the U.S. Supreme Court, and a tax partner at McKinsey. He is the organizer of a Christian outreach program called "The Thursday Men's Breakfast," which meets with men in the business world twice a month in midtown Manhattan. Mark received an A.B. from Harvard, an M.Litt. from Oxford, and a J.D. from Yale Law School. He currently lives in Pelham, New York, with his wife, Kim, and their three sons. His daughter is currently a student at Harvard.