Sean Gallagher

Polsinelli - Colorado


1401 Lawrence Street, Suite 2300
Denver, CO 80202

720 931 1163

Labor and employment Star

Practice area:

Labor and employment

Sean Gallagher has spent more than 25 years fighting for his clients in boardrooms and courtrooms across the country, and is one of only a handful of lawyers in Colorado history to have argued a case in the Supreme Court of the United States and prevailed with a unanimous decision. He is also been elected by his peers as a Fellow in the College of Labor and Employment Lawyers. 

Sean’s active trial and appellate practice emphasizes three general areas: 

  • employment counseling/litigation
  • commercial litigation
  • constitutional/public policy matters

As a member of the firm’s Labor and Employment practice, Sean assists employers in implementing proactive employment policies that help minimize the risk of litigation. When necessary, however, he represents management in all aspects of employment litigation, including cases involving covenants not to compete, wage and hour violations, breach of fiduciary duty and discrimination.

His representative commercial litigation experience includes cases involving claims for breach of contract, common law fraud, securities fraud, defamation, unfair competition, consumer protection violations, theft of intellectual property, whistleblowing, ERISA, Medicare payer rules, state and local tax matters and corporate governance disputes.

Many of Sean’s cases involve disputes in which the client’s business interests collide with government regulations and policies, often in a very public way. Sean has represented companies, trade associations, political leaders and public servants with a broad spectrum of public policy, constitutional, and election matters, including several First Amendment cases of national significance. He has served as counsel for four presidential campaigns, has twice been appointed a Special Assistant Attorney General by the State of Colorado, and has been retained on multiple occasions by the U.S. Department of Justice to represent federal officials in civil litigation. In 2012, he successfully represented two U.S. Secret Service agents in the Supreme Court of the United States in Reichle v. Howards, 566 U.S. 658 (2012) where he obtained a unanimous decision on behalf of his clients in a case involving the scope of civil liability of Secret Service agents protecting the President and Vice President. 

Last updated September 2019