Bannister is married and has one daughter, Brynn, who was born in the 2008 offseason. He is a devout Christian and the oldest son of former Major League All-Star pitcher Floyd Bannister, who pitched from 1977 to 1992 with Houston, Seattle, Chicago (AL), Kansas City, California, and Texas. His uncle, Greg Cochran, also played in the Yankees\' and Athletics\' minor league systems. His brother Brett spent time as a pitcher in the Mariners\' system, and his brother Cory pitched at Stanford. Brian and Brett are both members of Lambda Chi Alpha Fraternity.\n', '

Bannister was born in Scottsdale, Arizona. He had a remarkable high school career at Chaparral High School, former home of Chicago White Sox star Paul Konerko, as he was named All-Region and All-City in 1997, 1998 and 1999. Chaparral was the runner-up to the state title in 1997 and 1998, but in Bannister\'s senior year, he helped take home the state championship by striking out seven of the nine batters he faced in the championship game.\n', '

He began his college career as a walk-on at the University of Southern California. Entering as a second baseman, he became a full-time pitcher before the start of his freshman season. He posted an ERA of 4.35 in ten games out of the bullpen in his freshman year. Acting as the team closer during his 2001 sophomore campaign, he compiled a 2.80 ERA in thirty-five relief appearances. Bannister helped the Trojans to the College World Series in both 2000 and 2001 while pitching alongside former Major Leaguers Mark Prior and Anthony Reyes. He redshirted in 2002, due to arthroscopic elbow surgery to remove impinged scar tissue in his elbow. He was drafted by the Boston Red Sox in 2002, but did not sign. He returned to the Trojans in 2003 to play his junior year, which was also his first year as a starter. In eighteen games (fourteen starts), Bannister compiled a 6–5 record with an ERA of 4.53.\n', '

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