Graduate, St. Mary's College, Moraga, California, 1944.
He served in the United States Navy in World World War World War II In 1948, he twice harpooned a whale in the documentary film Harpoon. In 1948, he was cast as a detective in the film Sorry, Wrong Number, starring Burt Lancaster and Barbara Stanwyck for Paramount Pictures. In 1953, Bromfield appeared with Esther Williams, Van Johnson and Tony Martin in the film Easy to Love.
In the middle 1950s, he appeared in westerns, such as National Broadcasting Company"s Frontier anthology series in the role of a sheriff in the episode "The Hanging at Thunder Butte Creek".
He also starred in horror films, including the 1955 3D production Revenge of the Creature, one of the Creature from the Black Lagoon sequels. In 1956, Bromfield was cast as law enforcement officer Frank Morgan in the syndicated western-themed crime drama series, Sheriff of Cochise, later retitled by studio boss Desi Arnaz, Senior, as United States. Marshal.
The real sheriff of Cochise County at the time, Jack Howard, visited the set when the program began and made Bromfield an honorary deputy. Bromfield once told The Los Angeles Times: "About 40 million see "Sheriff of Cochise" or "United States. Marshal" every week.
I"d have to do about twenty-five pictures, major pictures, over a span of eight or nine years for enough people to see me in the theater who see me in one week on "United States. Marshal".
. The show is seen all over the world. Television is a fabulous medium." The series was actually created by his co-star Stan Jones, who appeared in twenty-four segments as Deputy Harry Olson.
In 1960, Bromfield retired from acting to produce sports shows and work as a commercial fisherman off Newport Beach, California.
Bromfield was divorced from actresses Corinne Calvet (1925–2001) and Larri Thomas (1932-2013). The Colt Revolver in the American West—John Bromfield"s Official Police Model.
Actor numerous films including The Furies, Rope of Sand, Sorry Wrong Number, Flat Top, Hot Cars, Revenge of the Creature From the Black Lagoon, Curucu, Crime Against Joe, Easy to Love, Ring of Fear, Hold That Line, Quin Cannon Fronteir Scout, Cimmeron Kid, Manfish, Harpoon, Fronteir Gambler, The Big Bluff, (television series starring roles) The Sheriff of Cochise, The United States Marshall, Fire Side Theater, Schlitz Playhouse of Stars, (guest appearances) Ann Sothern Show, Marie Wilson Show, Lucy-Desi Show, Dick Clark Show, Bob Hope Specials (2), (host) Fisherman's World.
Member New Bedford Port Society (life).
Married Mary Ellen Tillotson, May 5, 1965.