Gerard K. O’Reilly

Gerard O’Reilly serves as Co-Chief Executive Officer and Co-Chief Investment Officer of Dimensional Fund Advisors LP and is a Dimensional Director. He was named Co-CEO in 2017 and has been with Dimensional since 2004. Along with Co-CEO Dave Butler, Gerard guides the firm’s vision and strategy through daily oversight of the company’s people and processes. As Co-CIO, he drives innovation across Dimensional’s investment offering with fellow Co-CIO Savina Rizova.

Since joining the firm, Gerard has been instrumental in the evolution of Dimensional’s systematic approach to creating and implementing investment solutions. He was formerly Head of Research, managing the firm’s rigorous, scientific approach to interpreting, testing, and applying research in portfolios. He is a member of the firm’s Investment Research Committee, which reviews potential investment strategy enhancements, and a member of the Investment Committee, which oversees portfolio and account management. He also serves on the Boards of Dimensional’s US mutual funds and exchange-traded funds.

Prior to joining Dimensional, Gerard obtained his PhD in aeronautics from the California Institute of Technology. He holds a master of science degree in high performance computing from Trinity College Dublin in his native country of Ireland, where he also received a first class honors degree in theoretical physics and was a recipient of the Foundation Scholarship.