What famous Swiss citizen said this of nuclear bombs If you had know you would have become a watchmaker?

The full quote is "The release of atom power has changed everything except our way of thinking....the solution to this problem lies in the heart of mankind. If only I had known, I should have become a watchmaker."

This is one of Albert Einstein's most famous quotes on Peace and War. Though born in Germany, he held German, Swiss, Austrian, and American citizenship at various stages throughout his life.