Marsh is a founding partner of Halberg Criminal Defense – Minnesota’s largest and most experienced criminal defense law firm. Marsh has spent the past 37 years focusing on criminal law – acting as both a prosecutor and defense attorney. He has handled some of the most notable cases in the State of Minnesota. Marsh has tried well over 100 criminal jury trials and literally thousands of criminal court trials. He has garnered extensive experience in both state and federal court handling all types of criminal litigation, including homicide, criminal sexual conduct, drug offenses, complex white collar crimes, vehicular injury and DWI cases.

It is of value for a defense attorney to know how the other side thinks. As a former Chief Prosecutor for the City of Edina and the Metropolitan Airports Commission (MAC), Marsh supervised the prosecution of over 15,000 criminal cases annually. Marsh has also previously served as an Assistant Carver County Attorney in Chaska, Minnesota.

Marsh is one of Minnesota’s most requested Continuing Legal Education speaker on criminal law issues. He is the author of numerous training manuals and criminal law seminar materials. Notably, Marsh is the editor-in-chief of The Minnesota DWI Deskbook, the most comprehensive DWI source book for attorneys in Minnesota. Marsh also assists in the training of newly appointed Minnesota District Court Judges.