John F. Sullivan, III

John F. Sullivan, III, is a criminal defense lawyer whose practice focuses on DUI, DWAI, and state and federal criminal matters. He has handled thousands of cases and brings extensive courtroom experience to his representation. His work helps clients protect their rights, understand the charges they face, and navigate serious criminal proceedings with strong advocacy. Clients rely on his practical judgment, careful preparation, and deep experience in criminal defense litigation.

John earned his law degree from Indiana University. He also received his undergraduate degree from Georgetown University, where he completed a double major in Finance and International Management. His education gave him a strong foundation in legal analysis, advocacy, and strategic thinking.

Throughout his career, John has served in both prosecution and defense roles, giving him a broad understanding of the criminal justice system. After law school, he worked as a Deputy Prosecutor and later as Chief Deputy Prosecutor and Chief Counsel of a criminal division. He later moved into criminal defense and founded his own practice. Clients benefit from his ability to evaluate cases from multiple angles and develop effective trial and defense strategies.

John F. Sullivan, III has tried more than 120 jury trials and practiced before federal and appellate courts in multiple jurisdictions. His experience includes work in federal court, state court, and a wide range of counties and districts. Clients value his disciplined approach, courtroom skill, and steady representation in high-stakes matters. He remains focused on helping individuals facing criminal charges defend their rights and move forward with informed legal support.

Law Office Affiliations

• Owner, John F. Sullivan, III Attorney at Law
• Member, Colorado Bar Association
• Member, Colorado Criminal Defense Bar

Licensed State

• Colorado

Education

• Indiana University
  Juris Doctor (JD)
• Georgetown University
  Bachelor’s Degree in Double Major: Finance/International Management

Awards & Badges