ESPN

O'Brien, 55, previously spent four seasons as the Boston Celtics' head coach, compiling a 139-119 record (.539) with playoff appearances in 2002 and 2003, including a trip to the Eastern Conference Finals in 2002. After coaching the Celtics, O'Brien coached the Philadelphia 76ers for one season in 2004-05, compiling a 43-39 record and making the NBA Playoffs. He then spent two seasons writing an online column for ESPN.com, The Insider.

O'Brien has been in the coaching profession since 1974-75, serving as an assistant coach at Wheeling Jesuit College, Pembroke State College, the University of Maryland, Saint Joseph's University, the University of Oregon, the New York Knicks, the University of Kentucky and the Celtics. He has also been a head coach for Wheeling Jesuit and the University of Dayton.

O'Brien played collegiately at Saint Joseph's University and is in that school's Hall of Fame as well as the Big Five (Philadelphia) Hall of Fame. He earned his Bachelor's Degree from Saint Joseph's in 1974 and received his MBA from the University of Maryland in 1981.

You'll have a chance to interact with the new coach on Wednesday at 2 p.m. ET. O'Brien will stop by Pacers.com to chat live with fans, so send in your questions now and check back on Wednesday at 2 to chat live!