ROBERT REFFKIN is a husband, a father, and the founder and CEO of Compass, a real estate technology company that is now the largest independent brokerage in America, having helped clients buy and sell homes worth more than a quarter-trillion dollars since its founding. Reffkin graduated from Columbia in two and a half years, earned an MBA from Columbia Business School, and worked at McKinsey, Lazard, and Goldman Sachs. He ran fifty marathons, one in each US state, to raise $1 million for charities— including America Needs You, the nonprofit he founded to serve young people living below the poverty line who are the first in their families to go to college.