John Groenveldt (bap.1648 d.1715/16) alias Greenfield, was a physician and surgeon. He began studying medicine at the University of Leiden and finished his degree at Utrect in 1670. Greenfield joined the Colegium Medicum and had a successful medical practice with partner Henricus Velthuys in Amsterdam where they provided surgical and medical services as well as administered medicines. He moved to London and joined the Royal College of Physicians in 1683. He fought censors and several law cases over some of his medicines which caused his practice to decline in the early 1700s.
Reference
Harold J. Cook, ‘Groenevelt, Joannes (bap. 1648, d. 1715/16)’, Oxford Dictionary of National Biography (Oxford University Press, 2004; online edn, Jan 2008, http://www.oxforddnb.com/view/article/11651 (accessed 25 Jan 2017]).
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