Returning to Forest Hills, N.Y., from the Philippines in 1947, he met and married Nancy Keane, the younger daughter of Cmdr. Thomas J. Keane, the first national director of Sea Scouting.
During his career he worked as a cost engineer for Allied Chemical, as a civil engineer with Arabian American Oil (ARAMCO), and as international purchasing supervisor for Atlantic Richfield (ARCO). He retired at 55 to pursue his love of golf, gardening, and tinkering.
Mac died March 25, 2018. He was predeceased by Nancy in 2016. He is survived by daughter Deirdre Cole, son Keane McCarthy, five granddaughters, and five great-grandchildren.