Gabbert was born in Oxnard, California on June 20, 1909. In 1912, when he was three years old, he moved with his parents to Riverside, California. His father, J. R. Gabbert, purchased the Riverside Enterprise newspaper and worked as both editor and publisher. Gabbert grew up working with the metal type in his father's print shop at the press.
Following his graduation from Boalt Law School, Gabbert was admitted to the California Bar on October 16, 1934 and to the Philippine Islands Bar in 1945. Gabbert served as Deputy District Attorney for Riverside County from 1935 to 1938. He next went into private practice with the father and son legal team of Best & Best in Riverside, thus forming the new firm of Best, Best & Gabbert in 1938, where he practiced law until 1943 and then from 1945 to 1949. He also served as a City Court Judge for Riverside County from 1941 to 1943. In 1949, he was appointed by Governor Earl Warren as a Judge in the Superior Court of Riverside County, a position he held from 1949 to 1970. In May 1970, Governor Ronald Reagan appointed him as a Presiding Justice of the California Appellate Court, Fourth Appellate District, Division Two, a position which he held until his retirement on June 1, 1974.
Civic involvement
Gabbert served as a school board member for the Riverside Unified School District from 1946 to 1949. He is a former president of the Riverside County Bar Association as well as the Lions Club, the Present Day Club, and the Citizens University Committee. He also served on a variety of civic and charitable organizations both in a membership as well as a leadership capacity and was a member of the Executive Committee of University of La Verne College of Law.
In his role as President of the Citizens University Committee, Gabbert worked with Rupert Costo and other civic leaders to lobby the University of California system to establish a campus in Riverside.
Marriage and children
Gabbert married Katherine Jeanette Fuller in Tulare, California on June 11, 1938. The couple had three children:
Sarah Gabbert
Katherine Gabbert
Scott Gabbert
Political views
Gabbert was registered as a Republican.
Books
Boyce, A.M. Odyssey of an entomologist: adventures on the farm, at sea, and in the university / by Alfred M. Boyce; based on taped conversations with John G. Gabbert; edited by Elizabeth Lang and Robert Lang. Riverside, CA: UC Riverside Foundation.
Fitch, Robert J. and John G. Gabbert. Roman Warren: cowboy aviator. Riverside, CA: Riverside County Historical Commission Press.
Audiovisual materials
Gabbert, John G. Riverside, my Riverside John G. Gabbert remembers, 1915–1925. Riverside, CA: LIFE Society, UC Riverside Extension. DVD
Gabbert, John G. When all the world was young: John G. Gabbert in his 20s. Riverside, CA: LIFE Society, UC Riverside Extension. DVD