Marshal has served on the Board of Trustees since the 1999-2000 school year.
Born in Montreal, Quebec, Marshal earned his LLM in taxation from NYU Law School. He practices tax law in New Haven. Practice areas include estate planning, pension, federal income taxation corporate, and probate.
He is also a member of the Connecticut, New York State, and American Bar Associations, as well as the Florida Bar. He is board-certified in taxation by the Florida Bar Association. From 1981 to 1984 he was on the board of directors of the Connecticut Estate and Tax Planning Council. He also served for many years as chairman of the Woodbridge Zoning Board of Appeals and was the town moderator of Woodbridge from 1994 to 1998.