Nicknamed the "Conference of Champions," the Pac-12 has won more NCAA National Team Championships than any other conference in history; the three schools with the most NCAA team championships belong to the Pac-12 (UCLA, Stanford and USC, in that order). With Arizona State's softball title in 2011, the conference won its 400th NCAA Championship. The current commissioner of the conference is Larry Scott who replaced Thomas C. Hansen, who retired in July 2009 after 26 years in that position. Prior to joining the Pac-10, Scott was Chairman and CEO of the Women's Tennis Association.