Mortimer Joseph 'Tim' Buckley (born 1969) is an American business executive who served as CEO and Chairman of The Vanguard Group from January 1, 2018, until stepping down as CEO in 2024, transitioning the role to Salim Ramji while remaining involved in an advisory capacity. He graduated from Harvard College in 1991 with an A.B. in history and earned an M.B.A. from Harvard Business School in 1993. Buckley joined Vanguard in 1991 as an assistant to the chairman and built a long career at the investment management firm known for its low-cost index funds. He held various leadership roles including chief administrative officer, managing director, president, and chief operating officer before becoming CEO. Under his leadership, Vanguard grew its assets under management to over $8 trillion while maintaining its client-first philosophy founded by John C. Bogle, emphasizing innovation in digital services and sustainable investing. Known for his low-profile approach, Buckley focused on internal operations at Vanguard, a company structured to prioritize shareholder interests over executive compensation. His tenure was marked by steady expansion and a focus on long-term investor interests without major public controversies.