Personal life
Hart was of Spanish and Portuguese heritage.[5]
During his 1940s stint writing for Timely Comics, Hart lived in New Haven, Connecticut and commuted to New York City with his scripts.[11] At the time he was living with his first wife and their sons, Allan (d. May 31, 1999) and Lance. When Lance was 9 years old, in the early 1950s, the family moved to Orange, Connecticut, where they built a house near a veterinary clinic run by Hart's longtime friend Leon Whitney. Partly through this connection, Hart and his son Allan eventually became beagle breeders whose dogs included the bench champion Lynnlann's Button Up. Hart continued as a freelance writer, and combining his vocations by writing and editing nonfiction books for dog-owners. He became a dog-show judge and importer of German shepherds, and in 1960, with Charles Kaman, co-founded the nonprofit Fidelco Breeders Foundation to produce German shepherds of "true working dog temperament and utility."[5]
He remarried following his divorce from his first wife. He and his second wife, Kay, lived for a year on Spain's Costa del Sol, returning to the U.S. in June 1965. They then moved to Scotch Plains, New Jersey, to be closer to his work.[5]
In 1968, Hart moved to Clearwater, Florida,[5][12] He resided there at the time of his death, though his death certificate was issued in Connecticut.[2]
While living in Florida, Hart painted and donated a 25-foot oil-on-canvas mural to the New Haven Central Hospital for Veterinary Medicine, depicting "the dog's place alongside man throughout the development of civilization. It portrays cavemen, cape hunting dogs, a policeman with a German Shepherd, hunters with pointers and setters, a little old lady with a pet, and small children playing with dogs."[5][13]