Original OOC Boys swimming in the river signed Rosenfeld 1955 in good condition see pics signed L S Rosenfeld for Dr Leonard S Rosenfeld swimming in the east river new york city, 29" x 39" frame size see pics listed artist. (December 14, 1926 – December 2, 2009) was an American expressionist artist who was born in Brooklyn, New York. In the Post-World War II era, Rosenfeld associated with a group of artist known as the New York School. His contemporaries and prominent New York School artists included Willem de Kooning, Franz Kline, Arshile Gorky, Mark Rothko, Clyfford Still, and Robert Motherwell.