In 1943, he took 2nd, behind Vincenzo Nestler, in Florence (10th ITA-ch). In 1956, Grohe purchased Carl Nestler Armaturenfabrik with its factory in Lahr/Schwarzwald. German rocket scientist Wernher von Braun bought two "Nestler" slide rules in the 1930s. After the lyceum was restored to University status, Nestler obtained Doctorate of Philosophy. During his teaching Nestler included a special section dealing with scientific animal and plant breeding. Nestler is a graduate of Herricks High School in New Hyde Park, New York.