 He attended the Loyola University Chicago School of Law, where he earned a Juris Doctor degree, and the University of Chicago, where he earned a master's degree in public policy.Quigley was first elected to the Cook County Board of Commissioners in 1998, succeeding Maria Pappas who was elected Cook County Treasurer.During his tenure, he has gained a reputation as a reformer, as he opposed tax hikes supported by Cook County Board President John Stroger, and later his son and successor Todd Stroger.