Oral history interview with Walter H. Evans, III conducted by Jim Strassmaier from June 6-9, 1988, as part of the Senator Mark O. Hatfield Oral History Project. Evans served as an aide and legal counsel to Hatfield.

Oral history interview with Gerry Frank conducted by Jim Strassmaier from May 25, 1988, to May 2, 1990, as part of the Senator Mark O. Hatfield Oral History Project. Frank supported Hatfield's political career and served as his chief of staff.

Oral history interview with Wesley Granberg-Michaelson conducted by Jim Strassmaier from October 18, 1988, to May 28, 1989, as part of the Senator Mark O. Hatfield Oral History Project. Granberg-Michaelson served as a foreign policy advisor on Hatfield's staff from 1969 to 1976.

Oral history interview with Richard H. Jones conducted by Jim Strassmaier from December 11, 1987, to January 13, 1988, as part of the Senator Mark O. Hatfield Oral History Project. Jones served as Hatfield's campaign chair in 1958, 1966, 1978, and 1984.