The M7 Howitzer Motor Carriage, dubbed the Priest, was the most successful and widely used example of American self-propelled artillery during WWII. Examples continued to be used by the U.S. Army during the Korean war, and beyond, even serving Allied countries into the 1970s.

An avid military vehicle enthusiast whose collection includes 10 Vietnam-era vehicles, it not surprising that most of his 100+ published books focus on US military vehicles. In June 2015, he was presented the coveted Bart Vanderveen Award by the Military Vehicle Preservation Association, given in recognition of "...the individual who has contributed the most to the historic preservation of military vehicles worldwide."