Grant T. Sullivan

Date of Judicial Appointment: January 1, 2024

Professional Background

Before his appointment to the court, Judge Sullivan practiced law as a trial and appellate litigator with the Colorado Attorney General’s Office from 2011 to 2023.  He served in both the Public Officials Unit and the Tax Unit, specializing in constitutional law, voting rights, election law, tax, administrative law, and appeals.  Judge Sullivan previously practiced law with the Denver office of a national firm and served as a Supreme Court Fellow with the National Association of Attorneys General. He clerked for Judge John Webb on the Colorado Court of Appeals and Justice Nathan Coats on the Colorado Supreme Court.   

Judge Sullivan is admitted to practice before the United States Supreme Court, the U.S. Court of Appeals for the Tenth Circuit, the U.S. Court of Appeals for the Ninth Circuit, the U.S. District Court for the District of Colorado, and all Colorado courts.

Education

Judge Sullivan received his Juris Doctorate from the University of Colorado Law School.  He earned his Bachelor of Business Administration degree, majoring in finance, from the University of Texas at Austin’s McCombs School of Business. 

Professional Activities and Civic Engagement 

Judge Sullivan is active in many professional organizations.  He is a member and past president of the Minoru Yasui American Inn of Court, which is dedicated to improving the skills, professionalism, and ethics of the bench and bar.   He is also a member of the Colorado and Denver Bar Associations and is active in the CBA’s Appellate Subsection.  Before his appointment, Judge Sullivan served as a volunteer attorney with Metro Volunteer Lawyers’ post-decree clinic, providing pro bono counsel to unrepresented litigants in domestic cases.

Judge Sullivan also serves his community outside of the legal profession, volunteering for the Food Bank of the Rockies and A Little Help. 

Personal

Judge Sullivan was born and raised in a rural farming community in Kansas.  He enjoys spending time with his family skiing, backpacking, hiking fourteeners, and finding Colorado’s best hot springs.