Hill & Robbins has represented both individuals, corporations, governmental entities and classes in prosecuting and defending state and federal antitrust claims. Before founding the firm, Robert Hill taught antitrust law as a Visiting Associate Professor of Law at the University of Colorado Law School and established the Antitrust Section of the Colorado Attorney General's office where he served as First Assistant Attorney General.

• Co-Lead Counsel for a class of 350,000 natural gas consumers in Brewer v. Southern Union Company, Civil Action No. 83-F-1173 (D. Colo.), involving natural gas price-fixing in the State of New Mexico—settlements achieved in that case recovered approximately $75 million for the class
  
  
• Defense counsel for the City of Black Hawk and other Defendants in an antitrust suit brought by Central City. All claims against all Defendants were eventually dismissed by the Trial Court, including all antitrust claims, and the dismissal was affirmed by the Tenth Circuit Court of Appeals.
  
  
• EchoStar Satellite Corporation v. Brockbank Insurance Services, et. al. (D. Colo. 2000): the firm represented a Lloyd's syndicate in defending a major antitrust action involving satellite insurance. After successfully persuading the court their jurisdiction was lacking, Echostar dismissed its claims.
  
  
• Defense Counsel for Mountain Shadows Physician-Hospital Organization (“PHO”), a Colorado state court antitrust action brought by an ambulatory surgical center.