This article is about the governor of Pennsylvania, and long-time Pittsburgh mayor. For other people named David Lawrence see David Lawrence (disambiguation).David Leo Lawrence (June 18, 1889 – November 21, 1966) was an American politician who served as the 37th Governor of Pennsylvania from 1959 to 1963. He is to date the only mayor of Pittsburgh to be elected Governor of Pennsylvania. Previously, he had been the mayor of Pittsburgh from 1946 through 1959.