Biographies of American Seedsmen and Nurserymen Dreer, William F.–(1849-1918)–Philadelphia, Pennsylvania–Was born in Philadelphia, November 11, 1849.  He carried on the business of his father Henry A. Dreer after his father’s death in 1873.  He made numerous trips to foreign countries to study growing methods and to establish relationships with foreign seedhouses.  He was an active member of the Pennsylvania Horticultural Society, treasurer from 1887-1888 and from 1898-1899.  He had extensive private gardens at his three residences in Rosemont, Pennsylvania, Santa Barbara, California, and Woodstock, Vermont.  He died in Vermont, September 8, 1918.
Sources:  Bailey; PHS1