Casimir A. Sienkiewicz was a prominent economist and banker who emigrated from Poland in 1906. He advised federal, state, and local governments, was an active civic and community leader, and was also a well-known impressionist painter. In 1964, he was named first chairman of the Southeastern Pennsylvania Transportation Authority (SEPTA), one of the largest urban mass transit agencies in the nation. He resided here from 1938 to 1974.