John J. Brennan (businessman)
John J. Brennan (born 1954), also known as Jack Brennan, served as Chairman of The Vanguard Group from 1996 to 2009, and was Vanguard CEO from 1996 to 2008, when he was succeeded by William McNabb.
John J. Brennan (born 1954), also known as Jack Brennan, served as Chairman of The Vanguard Group from 1996 to 2009, and was Vanguard CEO from 1996 to 2008, when he was succeeded by William McNabb.