Prominent Rotterdam physician.

Stads-Medicanae Doctor of Rotterdam (1760). Met Franklin and Sir John Pringle during their continental tour (1766). Received the title of “professor” from the city of Rotterdam because he instructed physicians in the merchant marine (1770). Original member and early director of the Batavian Society for Experimental Philosophy. Wrote important treatises on bovines and on smallpox vaccines.

Son of François and Maria (Walop) de Monchy of Gouda. Educated at Leyden (M.D. 1739). Married Maria Petronella van Hoecke (1747); their son François Willem de Monchy, another Rotterdam physician, also corresponded with Franklin.