O\'Brien attended the Alta Loma High School in Rancho Cucamonga, California. As a senior, he averaged 24 points, 7.4 rebounds and 2.1 steals, earning a first-team all-league selection, being nominated for the McDonald\'s All-American and ended as Alta Loma\'s all-time leading scorer with 2,200 points.\n', '

O\'Brien began his basketball career with Utah. In his freshman season, he played in 22 games starting 21 averaging 6.4 points, 5.5 rebounds and 1.2 assists in 27.7 minutes after missing 9 games due to a broken foot.\n', '

The next year, O\'Brien transferred to San Diego State and sat out that season. On his sophomore season, he played in all 34 games, starting 33 averaging 7.2 points on 52.6 percent shooting, 4.5 rebounds and 1.5 assists. He scored in double figures in 10 of his final 16 outings, including six of his final 11 games, ending with 13 double-figures scoring. He was the Mountain West Player of the Week on January 28.\n', '

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