John Y. "Doc" Henderson , circus veterinarian in United States Henderson was born * 1907-11-11 in Kerr County, Texas United States dead 1991-06-14 Sarasota, Sarasota County, Florida, in United States Married 1946 to Martha Schepp born 1911 in Germany . For over 40 years he was veterinarian of Ringling Bros. and Barnum & Bailey Circus looking after the world’s largest traveling menagerie. He is recognized as an outstanding authority on the care and feeding of circus animals. Henderson went into WWII in 1944 and served until 1946, rejoing the circus with his new wife, Martha, an aerialist.