James W. Breyer (born July 26, 1961) is an American venture capitalist, founder and chief executive officer of Breyer Capital, an investment and venture philanthropy firm, and a former managing partner at Accel Partners, a venture capital firm. Breyer has invested in over 40 companies that have gone public or completed a merger, with some of these investments, including Facebook, earning over 100 times cost and many others over 25 times cost. On the Forbes 2021 list of the 400 richest Americans, he was ranked #389, with a net worth of US$2.9 billion.