Walter Riedel

Walter J H "Papa" Riedel ("Riedel I") (December 5, 1902–May 15, 1968) was a German-British engineer and rocket scientist who was the head of the Design Office of the Army Research Centre Peenemünde and the chief designer of the A4 (V-2) ballistic rocket. The crater Riedel on the Moon was named for both him and the unrelated German rocket pioneer Klaus Riedel.

Klaus Riedel ("Riedel II") and Walther Johannes Riedel ("Riedel III") were also Peenemünde engineers. Provided by Wikipedia