Value investing redefined

The Oakmark family of mutual funds is an extension of Harris Associates’ value-focused approach to investing. For more about our selection of funds, visit

The Oakmark Funds

111 South Wacker Drive, Suite 4600
Chicago, Illinois 60606
1-800-OAKMARK (625-6275)

Diane Mustain- Director and Portfolio Manager- Headshot

Diane L. Mustain, CFA

Director and Portfolio Manager

  • Portfolio Manager of Private Client Strategies
  • B.S., DePaul University, 1981
  • M.B.A., DePaul University, 1985
  • Executive Vice President and Head of Equities with Duff & Phelps Investment Management Co., 1981-2001
  • 39 years investment experience
  • Joined Harris Associates in 2002
See all team members

We do value investing differently

At Harris Associates, we don’t have an opinion about how equities will perform this year, if a recession will start or if the political parties will produce pro-growth candidates for 2020. As long-term investors, we don’t think it matters.