Brian Shortsleeve

Brian Shortsleeve is managing director at M33 Growth, a venture, and growth-stage investment manager that partners with founders and CEOs and seeks to rapidly scale and build industry-leading companies. He is passionate about helping founders and CEOs win in their markets by applying his experience driving operational excellence and executing strategic acquisitions. Prior to founding M33, Brian served as the Chief Administrator and Acting General Manager of the Massachusetts Bay Transportation Authority (MBTA). He was handpicked by Governor Charlie Baker in 2015 to develop a plan to put the MBTA on the path to long-term fiscal sustainability. During his tenure, Brian led efforts to reduce the operating deficit, leverage technology, and industry partnerships to modernize business processes and accelerate the pace of state-of-good-repair capital investment. Before the MBTA, Brian spent 14 years in strategy consulting and investing at Bain & Company, H.I.G. Capital, and most recently, General Catalyst, where he served as a managing director and led investments in software and technology-enabled services companies. Brian served on the boards of Axium Software (acquired by Deltek), CLEAResult (acquired by General Atlantic), Envoy Global, Oceans Healthcare, and OG Systems. Brian is a Massachusetts native, a graduate of Harvard College and Harvard Business School, and served as a Marine officer in Bosnia-Herzegovina and the Persian Gulf. He has been named one of the 50 Most Influential People in Boston by the Boston Business Journal and The Boston Globe named him to the “2016 Game Changers” list, which recognizes leaders doing extraordinary things to reshape life and work in the greater Boston area.