Tom Tierney is a recognized leader in serving the nonprofit sector. In 1999 he co-founded the Bridgespan Group, an independent, nonprofit organization designed to provide general management consulting services to foundations and other nonprofits. During 2000, he stepped down as Bain & Company's chief executive to concentrate on Bridgespan-related activities. More recently, he led the development of Bridgestar, a nonprofit Bridgespan initiative dedicated to enhancing and increasing leadership talent for the nonprofit sector.

Tom frequently speaks and writes on a variety of topics related to nonprofit leadership. He lectures at Harvard Business School and the Stanford University Graduate School of Business, and has contributed to numerous case studies and publications, including The Harvard Business Review and the Stanford Social Innovation Review; most recently, he contributed chapters to the Leader to Leader Institute's Leader of the Future and Indiana University Press's Taking Philanthropy Seriously. He has been profiled in various publications, including Learning From The CEO and Finishing Well. He also co-authored a popular book about organization and strategy entitled Aligning the Stars, which was published in April 2002 by Harvard Business School Press.

Tom joined Bain & Company in 1980 following graduation from Harvard Business School, where he received his MBA with distinction. He was promoted to partner after three years and from 1987 to 1992 served as the managing director of Bain's San Francisco office. In 1992, he became Bain's chief executive. During the 1990s, under his leadership, Bain & Company grew its revenues six-fold, while significantly expanding its international operations.

A native of California, he received his BA in Economics with highest distinction from the University of California at Davis, where he was honored as that year's most outstanding graduate. He served as a field engineer for Bechtel International in North Africa before entering business school.

Tom is a director of eBay, Incorporated and also serves on a number of nonprofit boards and advisory groups, including National Board of The Nature Conservancy, The National Center for Public Policy and Higher Education, the Hoover Institution, Woods Hole Oceanographic Institute, and The Harvard Business School Initiative on Social Enterprise. He is a past director of many other nonprofit organizations, including United Way of the Bay Area, United Way of Massachusetts Bay, The Committee for Economic Development, Catholic Charities, WGBH, and The National Academies.