where did he get his doctorate?
From Cornell University College of Veterinary Medicine
Peter Ostrum
In 1984, Peter Ostrum received his Doctorate of Veterinary Medicine from Cornell University College of Veterinary Medicine.
who played charlie in the 1971 charlie and the chocolate factory Peter Gardner Ostrum when did he start his career as a veterinarian? After receiving his  his Doctorate of Veterinary Medicine in 1984
wiki:20186722
Peter Ostrum [SEP] Veterinary career
Soon after Ostrum returned home from filming "Willy Wonka", his family acquired a horse; while the teenaged Ostrum was interested in the horse, it was the animal's veterinarian that left a lasting impression on him. Taking a hiatus from school between high school and college, Ostrum groomed horses and worked at the Delaware Equine Center in Pennsylvania. Ostrum contemplated a return to Hollywood, and even visited California for a week to "test the waters" there. He ultimately decided to pursue a degree in veterinary medicine instead, feeling that he would forever berate himself if he didn't. In 1984, Peter Ostrum received his Doctorate of Veterinary Medicine from Cornell University College of Veterinary Medicine.