Look at Albert Einstein working in his Theory of General Relativity in Zurich:
Einstein’s search for general relativity spanned eight years, 1907-1915. Some periods were quiet and some were more intense. The moments when the great transition occurred, came sometime between the late summer of 1912, when Einstein moved from Prague to Zurich, and early 1913.
Source (and context): A Peek into Einstein’s Zurich Notebook, from the absolutely advisable page of Goodies by Professor John D. Norton, (Department of History and Philosophy of Science - University of Pittsburgh), from now in my bookmarks.