Representative cases which Guy has handled at trial and before Montana courts include Ridley v. Guarantee National Ins. Co., 951 P.2d 987 (Mont. 1997) (advance payment by an insurance company for medical expenses to an injured claimant); Watters v. Guarantee National Ins. Co., 3 P.3d 626 (Mont. 2000) (requirement of a release before payment of policy limits); Cusenbary v. USF&G, 37 P.3d 67 (Mont. 2001) (insurance coverage under a general liability policy for liquor liability claims); Shilhanek v. D-2 Trucking, Inc., 70 P.3d 721 (Mont. 2003) (trial counsel involving insurers duty to advance pay medical expenses up to policy limits); Robertus v. Farmers Union Mutual Ins. Co., 189 P.3d 582 (Mont. 2008) (jury trial and appellate counsel on stacking of underinsured motorist coverage); Revelation Industries v. St. Paul Fire and Marine Ins. Co., 206 P.3d 919 (Mont. 2009) (insurance coverage and duty to defend under commercial general liability policy for defective workmanship claims); and Peterson v. St. Paul Fire and Marine Ins. Co., 239 P.3d 904 (Mont. 2010) (trial and appellate counsel for St. Paul alleging insurance bad faith and violation of Montana's Unfair Trade Practices Act). He is a member of the Yellowstone Area Bar Association and Montana Defense Trial Lawyers Association.

Guy has been a director and officer for the Montana Defense Trial Lawyers Association, and president of the organization in 2008 and 2009. He is peer-review rated at the highest level of legal ability and ethics (AV Preeminent) by Martindale-Hubbell, has been recognized in Best Lawyers in America, and selected by his peers as a Mountain States Super Lawyer for the years 2007 – 2019 in the area of civil litigation defense. Guy was also on the board of directors for the Montana Justice Foundation from 2004 through 2007.

Guy's litigation practice includes serious personal injury and traumatic brain injury cases, automobile accidents, liquor liability, products liability, and wrongful death and survival actions. His insurance law practice includes bad faith, insurance coverage and defense of agents and brokers. Guy also handles property damage cases including construction litigation, arson and fraud cases. He further acts as a mediator and has been accepted into the National Academy of Distinguished Neutrals (NADN).

Guy graduated with a B.A. from the University of Montana in 1981, and a J.D. from the University of Montana Law School in 1985. He was a law clerk to Justice John C. Harrison of the Montana Supreme Court from 1985 to 1986.