He was born in Point Pleasant, West Virginia, to Charles and Eva (Knight) Probst. He studied engineering at Ohio State University and graduated in 1906.
Early automobile design work by Probst included the design of the original Milburn Light Electric.[1]
Probst was recruited by American Bantam Car Company in 1940 to help it win a contract to provide the U.S. Army with a lightweight reconnaissance vehicle that could transport troops and equipment across rugged terrain. Bantam had provided the specifications to the Army, and Probst drafted the design for the Jeep in two days, commencing on June 17, 1940, Bantam's first hand-built prototype was complete and running by September 21, 1940, just meeting the forty-nine-day deadline and was delivered to the Army Quartermaster Corps for testing at Camp Holabird, MD.[2]
He died in Dayton, Ohio, on August 25, 1963.