 He is an avid collector of automobile license plates, serving as an officer of the Automobile License Plate Collectors Association and authoring the most prominent published work within the hobby, "License Plates of the United States" (), which was issued initially in 1994.Fox first became interested in license plates in 1954 when he was seven years old and at one time, he had a collection of 30 thousand plates.Fans and friends were always curious about his chosen hobby.