Ray has been an Associate of HUH since 1990 and was Curator of Vascular Plants for the New England Botanical Club (NEBC) from 1984 to 2008. Previously he was Assistant Curator from 1979 to 1984. Ray was associated with Harvard's Concord Field Station in Bedford, Massachusetts from 1974 to 1998. Past projects include publication of his Concord Area Trees, Concord Area Shrubs, Botanical Index to the Journal of Henry D. Thoreau, and Concord Area Trees and Shrubs. Currently Ray is working with David Boufford on an atlas of the flora of New England. Ray is also a regional reviewer for Flora North America.