Maxfield S. "Mac" Gibbons, 86, of Greenwich and a founder of the Green's Farms Association in Westport, died Dec. 30, 2010, in his home.

Born Feb. 17, 1924, in Wilkinsburg, Pa., he was the son of the late George Rison Gibbons and Helen Lewis Maxfield. He grew up in the Shadyside neighborhood of Pittsburgh; graduated cum laude from the Choate School, and from Yale University as a member of the Class of 1945W, signifying an accelerated class that completed four years of study in three years at Yale during World War II.

He later worked briefly as a reporter for the Pittsburgh Sun-Telegraph before joining the advertising agency, Ketchum, McLeod & Grove as a copywriter. In the early 1950s he was assigned to open their Manhattan headquarters and promoted to vice president. He met his first wife, Anne Thomas, in New York; they married in 1952 and divorced in 1976. The family moved to Westport in 1957.

After leaving Ketchum in 1963, he became a founding partner in the creative agency, Avery, Hand & Co., which produced reproductions of historic documents and models of early mechanical inventions. He sold his interest in the firm in 1969 and joined the brokerage house Merrill Lynch, Pierce, Fenner & Smith as a retail trainee and retired from the firm in 1984.

In 1970, Gibbons, along with Richard Sussman, founded the Green's Farms Association, a neighborhood watchdog group devoted to preserving the residential character of Westport. He remained on the G.F.A. as a board member emeritus until his death.

In 1977, he met Sally Knott Raynor; they married in 1978 and settled in Greenwich. In that town, he was an activist for preservation of historic buildings; president of the English Speaking Union, a member of Christ Church, and the Belle Haven Club.

He was also a member of the Gulfstream Bath & Tennis Club in Gulfstream, Fla., and the Circumnavigators' Club. He loved opera, salt-water fishing, gardening, writing, history, playing the piano and wintering in Florida. In his younger years, he was a skeet shooter and bird hunter.

Survivors, in addition to his wife, include his children, Nathaniel and daughter-in-law Lizz Marasciulo of Green's Farms, Mark of Westport; George of Manhattan, and Axie of Bridgeport; stepchildren, Nicholas Raynor of Alstead, N.H.; Andrew and Andrea Raynor, and two grandchildren, Catherine and Alex, of Rye, N.Y., and Sarah and Tony Revak of Reno, Nev.

Services will take place at 11 a.m. Friday in Christ Church, Greenwich. Private burial will follow. The family requests that memorial donations be made to the Connecticut Trust for Historic Preservation or to the P.A.W.S. animal charity.