This oral history interview with Lois D. Siegmund was conducted by Clark Hansen at Siegmund's home in Salem, Oregon, on June 23, 1988. In this interview, Siegmund discusses her early life in Gervais, Oregon, including her memories of life during World War I. She then discusses her early career in state government, her marriage to Jacob Laurence Siegmund, and quitting state government to work in a meat market with her husband. Siegmund then discusses returning to state government in 1951 as a legislative secretary, first for Representative Roy Houck, then for Representative Mark Hatfield. She talks about Hatfield's campaign for the state Senate in 1954 and about working as a secretary for him in the Senate. She also discusses Hatfield's campaign for Oregon secretary of state in 1956. She describes her duties as Hatfield's personal secretary, other members of Hatfield's staff, and Hatfield's marriage to Antoinette Kuzmanich.

Siegmund then discusses Hatfield's 1958 campaign for Oregon governor. She talks about the changes in Hatfield's staff after his election. She shares anecdotes about major events that occurred during his governorship, including the 1962 Columbus Day Storm, Hatfield's 1964 keynote speech at the Republican National Convention, and her role in keeping Hatfield on schedule. She also talks about Hatfield's relationship with Tom McCall, his campaign for the U.S. Senate in 1967, and her reasons for not going with him to Washington, D.C. She closes the interview by discussing her continued relationship with Hatfield.

This oral history interview with Mark O. Hatfield was conducted by Clark Hansen in Hatfield's office in Portland, Oregon, from July 29, 1998, to May 22, 2002. The interview was conducted in 33 sessions and the collection includes a transcript. Some sections of the interview have been redacted by Hatfield.

In sessions 1 through 4, Hatfield discusses his family background and early life in Dallas and Salem, Oregon. He talks about his experiences at Willamette University, his service in the U.S. Navy during World War II, and about his experiences at Stanford University after the war.

In sessions 5 through 8, he discusses current events at the time of the interview in 1998, and talks about his personal and political philosophy.

In sessions 9 through 14, he discusses his time serving in the Oregon Legislature as a representative from Marion County from 1951 to 1955, and talks about his involvement in Dwight D. Eisenhower's 1952 presidential campaign. He also speaks at length about his Christian faith and personal philosophy.

In session 15, he discusses his time serving in the Oregon Legislature; anti-communist sentiment in the 1950s; and his campaign for the Oregon State Senate in 1954.

In sessions 16 through 19, he discusses his service as a state senator from Marion County from 1955 to 1957, and as Oregon secretary of state from 1957 to 1959, including his 1956 campaign.

In the bulk of sessions 20 through 28, he discusses his service as Oregon governor from 1959 to 1967, including appointments he made and his international travels; in session 21, he speaks about his marriage to Antoinette Kuzmanich and about her background.

In sessions 29 through 33, he discusses his opposition to the Vietnam War. He talks about serving in the U.S. Senate from 1967 to 1997, including his 1967 campaign.