Mac received his J.D. from Hastings College of the Law in 1970. He was a member of the Order of the Coif, Thurston Society and Issue Editor of the Law Review.
Mac was admitted to the Washington State Bar in 1970 and became a partner at Bogle & Gates in 1976. In 1998, Mac left Bogle & Gates to become a sole practitioner. He is a trial lawyer with almost 40 years of trial experience in both state and federal courts. He has tried a broad range of jury and non-jury cases including lawsuits involving admiralty, products liability, insurance coverage, toxic tort, personal injury (representing both plaintiffs and defendants), construction, anti-trust, professional malpractice, employment law, condemnation, real estate, and general commercial. He has also served as a mediator and arbitrator in more than 2,000 cases over the past 25 years. The mediations and arbitrations have been in cases involving construction, personal injury, property damage, maritime law and insurance coverage.