 In 1947, he came to the US with Wernher von Braun under Operation Paperclip, by means of which the USA gained German engineers and scientists.He went to the US Army Signal Corps' Laboratories in Fort Monmouth, New Jersey, and became a US citizen in 1954.Ziegler's work in the US was very influential in the development of military electronics, especially in the electronics for the early phases of the US space program.