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Marshall was a founding partner of the Barrie, Ontario law firm of Graham, Wilson and Green, which grew from a three lawyer firm in 1975 to 35 lawyers serving five centres in Simcoe County, as "HGR Graham Partners". After 41 years, and ready for something different, he left the firm to help set up a legal department for the County of Simcoe. Marshall has served on the Education Committee of the Simcoe County Law Association, and has served on the executive of the Municipal Law Section of the Ontario Bar Association. He has lectured on various municipal law and civil litigation topics for various organizations, including the Law Society of Upper Canada and the Ontario Bar Association. He has handled hundreds of matters before the Ontario Municipal Board and dealt with municipal matters before all levels of the courts in Ontario.
Since 1973, Marshall has served as the President of the Greater Barrie Chamber of Commerce, a director and president of the Rotary Club of Barrie, and a founder and multi-time president of the Am Shalom Synagogue. He has served twice on fundraising campaigns for the Royal Victoria Hospital (now the Royal Victoria Regional Health Centre) seeing that institution move to hugely expanded facilities, and develop a regional cancer care facility. He chaired the fundraising campaign for an expansion of the Barrie YMCA (now the YMCA of Simcoe-Muskoka). He co-chaired the fundraising campaign for the hugely expanded Barrie Public Library. When that institution moved out of its old building, he assisted in the fundraising to turn the former library building into the MacLaren Art Centre. He served for fifteen years as a board member of Theatre by the Bay, Barrie's first professional theatre group in several decades.