Zumwalt was a Trustee of the American Health Foundation between August 1975 and December 1981. He was Vice Chairman of the Board of American Medical Buildings.
Zumwalt was Chief of Naval Operations and a member of the Joint Chiefs of Staff from 1970 until he retired in 1974. He died on Jan. 2, 2000, from complications after chest surgery for malignant mesothelioma. "Adm. Zumwalt took a special interest in diseases that might flow from service-connected causes and served as Chairman of several foundations dealing with these issues, including The Marrow Foundation, International Consortium for Research on the Health Effects of Radiation, Agent Orange Coordinating Council, Center for the Study of the Vietnam Conflict, National Marrow Donor Program (Chairman Emeritus), Vietnam Assistance for the Handicapped (Chairman, Advisory Board) and Health and Education Volunteers (Chairman, Advisory Board)." (Zumwalt obituary, Naval Office of Information, Jan. 2, 2000.)Zumwalt obituary / Navy Office of Information
Zumwalt's bio from the Admiral Chester W. Nimitz Memorial Lectureship in National Security Affairs, March 1989, lists him as the director of Aeronca Inc.; American Building Maintenance Industries; American Medical Buildings, Inc.; AP Industries, Inc.; Fathom Oceanology Ltd.; Fleet Aerospace Corp.; National Food Services Inc.; Navistar International Corp.; NL Industries Inc.; NL Chemicals Inc.; Unicorp American Corp.; and Langley Corp. He was a governor of the American Stock Exchange from 1979 to 1985 and a director of Esmark Inc. from 1975 to 1984.Zumwalt bio / Navy ROTC UC Berkeley
Zumwalt was a director of Navistar from 1984 until 1996. He was also a director of Dallas Semiconductor Corp., Fleet Aerospace Corp., Fleet Aeropspace Inc., NL Industries Inc. and Lincorp Savings Bank, and a former director of Ames Department Store, American Building Maintenance Industries, Esmark, Transway International, Todd Shipyards Corp. and Gifford-Hill & Company Inc. Richard F. Celeste, Chairman of the Health Effects Institute since 2001, was a director of Navistar from August 1993 to July 31, 1996; and Andrew F. Brimmer, who was a trustee of the Salk Institute circa 1971, was a director from 1976 to 1997.Navistar 1994 DEF 14A / Securities and Exchange Commission
Zumwalt was a director of NL Industries from 1987 until his death.NL Industries 1999 DEF 14A / Securities and Exchange Commission
In 1997, Zumwalt was on the Senior Advisory Council of the Fred Hutchinson Cancer Research Center, along with Stanley M. Little Jr., who participated in the National Conference on Smoking OR Health in 1981 as a Vice President of Boeing.Center News, June 19, 1997 / Fred Hutchinson Cancer Research Center
Zumwalt was a director of IDT from 1997 until his death. Former Rep. James A. Courter was a fellow director.IDT 1999 DEF 14A / Securities and Exchange Commission