Grenville Dean Wilson (January 26, 1833 - September 20, 1897), was an American pianist and composer, who composed over 150 pieces, mostly for piano solo. G.D. Wilson was born in Lenox, Massachusetts. He worked in Nyack, New York, as a piano teacher from about 1870 until his death. He was the founder and conductor of the Nyack Choral Society and the Nyack Philharmonic Orchestra. He also founded the Nyack Library.