German architect Herbert Ruhl worked in Berlin from 1924-37. He was influenced by the cubism style and mostly built villas in Dahlem and Frohnau, sections of Berlin, in the 1920s. One of his most famous buildings was the home of scholar and art collector Dr. Hans Paret in Dahlem, which became a prime example of Cubist construction. Ruhl also built the regatta course for the rowing competitions at the 1936 Berlin Olympics in Grünau and participated with its design in the Art Competitions. Sailing and rowing regattas had been held here since the 19th century. The tribune, which is still in use today, was opened during the European Championships in rowing in 1935. In 1936 it offered room for 9,000 spectators. In addition, the regatta houses East, Middle and West were built for the Olympic Games. From 1911-14 Ruhl had a studio for architectural ceramics together with his compatriot John Martens (1875-36).