Mr. O’Brien serves as President and Chief Executive Officer of A.G. Hill Partners, LLC, a family office with diverse interests in real estate, energy, private equity, and public securities. The family owns and operates Highland Park Village, a luxury outdoor shopping center in Dallas, Texas, and develops other multi-family, retail, hospitality and senior housing properties across the country.  In addition, the family sponsored the launch of Expedition Capital Advisors, LLC, a real estate private equity fund sponsor in 2016.

Previously, Mr. O’Brien was a Partner and Chief Operating Officer at Highside Capital, a multi-billion-dollar equity hedge fund in Dallas. He was a Partner and Portfolio Manager at Petra Capital Partners, a private equity fund for six years. Mr. O’Brien was a Vice President at Goldman Sachs in the private wealth management and prime brokerage divisions. He started his career as an investment banking associate at The Robinson-Humphrey Company in Atlanta, Georgia.

Mr. O’Brien graduated from the University of Virginia’s McIntire School of Commerce in 1986 and earned his Master of Business Administration from Harvard in 1992. He lives in Dallas, Texas with his wife and three children.