He joined private equity firm Claridge, which wasfounded by his father, Charles Bronfman in 1987. Bronfman took the head of the private equity firm Claridge and has served as its CEO since 1997. The firm has invested in artist tours by the Rolling Stones, Madonna, and Crosby, Stills, Nash and Young. Bronfman was responsible for increased investment positions in the high-end organic food and beverage industry, mainly through the creation of the Claridge Food Group. As the current Executive Chairman, he has overseen the firm's direct private equity portfolio invest, amongst others, in: Cirque du Soleil, CPI, Dick Clark Productions, TSN, Solotech, The Next Adventure, 49TH Parallel, Champlain Seafood, Circle Foods, NYSE, Tour Telus, Bassins dy Havre, Eagle Creek, Busbud, Cloudify, Facebook, Gigaspaces, Luxury Retreats. In 1999, he was named a director of Seagram, his family's conglomerate. Since the departure of the Expos, he has been involved in initiatives aiming to bring MajorLeague Baseball back to Montreal. The Claudine and Stephen Bronfman Family Foundation was launched in 2009 and primarily provides support to a variety of causes in Montreal. The foundation succeeds to the Andrea & Charles Bronfman Philanthropies launched by Stephen Bronfman's fatherand stepmother's, as their main charitable vehicle. Bronfman and his family came to prominence within Canada as key fundraisers for the Liberal Party of Canada.