[9][10] Frida Berrigan has estimated that her parents spent 11 of their 29 years of marriage incarcerated for antiwar activities, which affected family life.

[12][13][14] In college she studied with Pakistani political scientist Eqbal Ahmed, and she worked for Frances Crowe at the American Friends Service Committee.

[12][17] In another Hartung endeavor, she was a senior program associate at the New America Foundation's Arms and Security Initiative, also at the World Policy Institute, prior to February 2010.

[16] She is on the board of the War Resisters League, a secular pacifist organization that marked its centennial in 2023, and serves as a member of its national committee.

[22] She blurbed the book ARISE AND WITNESS: Poems by Anne Montgomery, RSCJ, About Faith, Prison, War Zones and Nonviolent Resistance, published in 2024.

[24] Her platform focused on affordable home ownership, in conjunction with her role as a convener of the New London chapter of the Southeastern Connecticut Community Land Trust.

The two began dating and married in June 2011 at All Souls Unitarian Universalist Congregation in New London,[4][16] in order to meet Sheehan-Gaumer, an atheist, halfway on faith.