Martin J. Costello

John M. Hughes

Thomas R. Hughes

Katrina E. Joseph

John G. Dillon


John G. Dillon


John G. Dillon is an associate attorney at Hughes & Costello, practicing in the areas of criminal law and employment and labor law.  John has over seven years prosecution experience, working in Hennepin County.  

John has tried many jury trials, hundreds of court trials, and he has handled thousands of criminal, traffic, and ordinance violation cases.  Additionally, John handles criminal defense cases in state and federal court.  John also assists Martin Costello in arbitrating employment and labor law grievances.


Bar Admissions
  • Minnesota state courts
  • U.S. District Court for the District of Minnesota