Werner von Braun is credited with inventing the V-2 rocket.
http://en.wikipedia.org/wiki/Wernher_von_Braun
The original plans were created by Goddard, but Von Braun improvised to make it work. I would divide the credit for the invention, but give Werner the credit for making it work. Read the article Ms Sue posted.
The V2 rocket was invented by a German engineer named Wernher von Braun. He was one of the key figures in the development of rocket technology during World War II. To find this information, you can search for "inventor of V2 rocket" on a search engine or browse related articles and books on the history of rocketry.
