[1] In 1875, he became an assistant to Franz König (1832-1910) in Göttingen, where he was habilitated for surgery in 1877.
In the ensuing years, he studied surgery with Bernhard von Langenbeck (1810-1887) and Heinrich Adolf von Bardeleben (1819-1895), later being appointed chief physician of the surgical department at the Städtisches Krankenhaus in Aachen (1881).
Riedel was a pioneer in the surgical treatment of appendicitis and cholecystitis.
[2] In 1888, he performed the first choledochoduodenostomy (anastomosis of the common bile duct to the duodenum).
This article about a German person in the field of medicine is a stub.