Stephen G. Brenner was not only the Bozo assigned the Maryland beat, he was also involved with carnivals and sideshows all his life. Brenner was born in 1894 and published his autobiography "My Life Story as a Clown" in 1978. He was an early, if not the first Bozo. Incidentally, There is a list of dozens of regional Bozos listed in Wiki. Larry Harmon is, of course, the most famous, but my favorite is Victor Trujilo of Mexico City who created "Brozo el Payaso Tenebrosco" (Brozo the Creepy Clown) shown here in a clip with his inspiration the Mexican Bozo.
Real Photo promotional card for Stephen G. Brenner, Collection Jim Linderman