Justice Hilton was born in Montreal on June 18, 1949 to Catherine Ross and Allan L. Hilton.
He graduated with a Bachelor of Arts degree from Sir George Williams University (now Concordia University) in 1970, and during the 1969-1970 academic year, he was a member of the University's Board of Governors as a student representative. He obtained a B.C.L. degree in 1973 and an LL.B. degree in 1974, both from McGill University.
Justice Hilton was admitted to the Quebec Bar in 1975, and began his practice at Laing, Weldon, Courtois, Clarkson, Parsons Gonthier and Tétrault, which has since become McCarthy Tétrault. His practice was concentrated on civil, commercial, constitutional and administrative law litigation, as well as medical liability. He appeared regularly before trial and appellate courts, including the Supreme Court of Canada on several occasions.
In 1996, Justice Hilton was admitted as a Fellow of the American College of Trial Lawyers and he has been a Judicial Fellow since 1998.
Justice Hilton sat as a councillor on the Council of the Bar of Montreal and the General Council of the Quebec Bar , as well as on numerous committees, including the Bar of Montreal's Liaison Committee with the Court of Appeal, which he presided for several years, and the Quebec Bar's Discipline Committee. He was also a Director of the Bar Foundation.
Justice Hilton was appointed to the Superior Court on January 29, 1998. He was appointed to the Court of Appeal on September 26, 2003.