In 1997, O'Brien became a full-time assistant at UC San Diego. After two years, he was elevated to the top job. After three seasons, the Tritons moved the program to Division II, joining the California Collegiate Athletic Association. O'Brien helped establish the Tritons as a strong program in the CCAA, leading them to the College World Series in consecutive years, finishing third and second in 2009 and 2010, respectively. He took over a struggling Santa Clara program in 2012, and has sought to rebuild it in his first two seasons.[2][6]
On May 24, 2017, O'Brien resigned from Santa Clara.[7]
Administrative career
Since resigning from field coaching, he has operated TEN90 Coaching Group, a company that specializes in baseball talent development. In 2018, San Francisco Giants then-Director of Player Development David Bell hired O'Brien to the development staff of the Giants. He has since held the title of Development Coach for the Giants.[8]
National champion
Postseason invitational champion
Conference regular season champion
Conference regular season and conference tournament champion
Division regular season champion
Division regular season and conference tournament champion
Conference tournament champion