Mark O’Brien

Mark O’Brien

O'Brien Greene & Co. - The Witherspoon Institute

Mark O’Brien is chief investment officer for O’Brien Greene & Co., an investment counseling firm based in Media, Pennsylvania. A 1973 graduate of Princeton University, he also received graduate degrees in business and the liberal arts from the University of Pennsylvania. He serves as a “preceptor” (seminar leader) in the Politics Department at Princeton when time and opportunity permit, and sits on the Board of Trustees of The Witherspoon Institute.