[2] He graduated from the Stevens Institute of Technology, and he attended the six-week Advanced Management Program at the Harvard Business School.
[2] According to the Chicago Tribune, "Under Mr. Hanigan's direction, heads of each Brunswick division were given major responsibilities to develop strategies and tactics that would earn the kind of return that shareholders would consider worthwhile.
[4] Hanigan served on the board of visitors of Georgetown University's School of Foreign Service.
[3] Hanigan's wife predeceased him in 1980,[4] and he resided in North Palm Beach, Florida.
[4] Hanigan died of Alzheimer's disease on July 1, 1996, in West Palm Beach, Florida, at age 84.