Coach O'Brien is a former college second baseman, who attended Massasoit Community College to play under legendary coach Tom Frizzell and then finished his final two years at Bridgewater State University under long time coach Rick Smith. He was fortunate enough be named a Team Captain his Senior year.​ Since graduating from Bridgewater State, he has worked with various age groups in the sport of baseball. He personalizes each drill to the current skill set each player possesses but will also challenge them to become better.

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He created O’Brien Performance Baseball not only to help improve player’s skill sets but to also make each player feel that they are his only client. By doing so, he has created a life-long bond with players and coaches that stay in touch long after their baseball days are over. Since starting in 2019 Coach O'Brien through O'BP Baseball has helped 30+ Athletes play at the next level. Many of those have excelled and have their name next to many accolades.