Walter Riedel

Walter J H "Papa" Riedel ("Riedel I") was a German engineer 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 co-named for him and the German rocket pioneer Klaus Riedel.

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