[1][2] He graduated from Huntington Beach High School in 1988 and attended the University of California, Riverside, where he earned a bachelor's degree in political science.
He was influenced by cartoonists such as Jeff MacNelly, Paul Conrad, Pat Oliphant and Don Wright.
[citation needed] Breen was about to become a high school history teacher when the Asbury Park Press offered him a job in the art department in July 1994.
Breen left the Union-Tribune in 2023 and joined the San Diego nonprofit news website inewsource later in the year.
They regularly appear in The New York Times, USA Today, Newsweek and U.S. News & World Report.