“In 1969, Mr. Karp was one of the first gallery owners to follow artists to SoHo, an industrial area that would quickly become as much an art gallery district as the Upper East Side. His O K Harris Works of Art — first at 485 West Broadway, then at its present address, 383 West Broadway — would become the first gallery on one of SoHo’s principal boulevards. He, like several other pioneers to venture south of Houston Street, liked to think of himself as SoHo’s unofficial mayor.”