Connor Olev Martin O'Brien (born 4 February 1961) is a Canadian investment-fund manager. He is president and chief executive officer of O'Shares Investments, a U.S.-based ETF adviser, as well as president, chief executive officer and chief investment officer of Stanton Asset Management, a Montreal-based investment-management company, which he founded in 2002. O'Brien had previously established a private-equity investment firm, Stanton Capital Corporation, in New York City. Before establishing his own businesses, he held positions at Merrill Lynch and Lehman Brothers.