John was born in 1766. The source below says he was a mariner/seaman.
The Genealogical quarterly magazine, Author: Putnam, Eben, 1868-1933, Pages: 428, p. 95. Language: eng, Publisher: Salem, Mass.: Eben Putnam, Date: 1900, Location: Internet Archive, Description: Editor: 1903-1905, E. Putnam; First volume also numbered as v. 10 of Salem Press historical and genealogical record, v. 10 of Magazine of New England history, v. 8 of Putnam's historical magazine; 16. Found via www.gengophers.com.