The Biographical series contains materials regarding Baker's career and life and includes articles, interviews and oral histories, his diaries, awards and appointments, family correspondence, photographs, and weekly schedules for his retirement years. The articles include papers written by and about Baker regarding his life, as well as materials collected by A. Michael Noll on three CDs. The earlier diaries include references to his research at Bell Labs, while diaries beginning in the 1950s are predominantly concerned with his daily life. The awards and appointments materials include awards certificates, correspondence about accepted the awards and congratulations, his acceptance speeches, programs, and articles. Most awards are from academic and professional organizations or corporations for his contributions to science, from government agencies for his service, and honorary degrees from universities. The photographs include portraits of Baker, Baker receiving awards, at events, or with members of boards he served on, and personal photographs of unidentified people and landscapes. The weekly schedules record meetings and events that Baker attended, and also include correspondence about the events, itineraries, and expenses.

May 2008 Accession consists of correspondence between family members prior to and following Allen Macy Dulles' injury as a Marine lieutenant in the Korean War. Prior to the injury, the correspondence documents Dulles's education and activities at primary school, Phillips Exeter Academy, Princeton University and Oxford University. Following the injury, materials include correspondence to and from Allen Macy Dulles, professional and personal correspondence of Allen Welsh Dulles and the Dulles family, correspondence with doctors regarding Dulles' physical condition, and military records including a citation for the Silver Star Medal which Dulles earned for his wartime leadership and bravery.