In 1817, he became one of the founders of the New York Lyceum of Natural History (now the New York Academy of Science), and one of his first contributions to this body was his Catalogue of Plants growing spontaneously within Thirty Miles of the City of New York (Albany, 1819).
I 1817 var han blandt grundlægerne af ”New York Lyceum of Natural History” (nu: New York Academy of Science), og et af hans første bidrag til organisationen var et Catalogue of Plants growing spontaneously within Thirty Miles of the City of New York (Albany, 1819).