His reputation was such that in 1589 de Vos together with Ambrosius Francken I was appointed by the Ghent magistrate to value the painting of the Last Judgment by Raphael Coxie.
Maerten de Vos had 11 pupils between 1564 and 1599: Balten Vlierden (1564), Wenzel Coebergher (1573), Hans Snyers (1575), Merten Boly (1577), Jaeckes Keerel (1577), Jan Adriansen Cnottaert (1584), Peeter Goutsteen (1588), Hans Cnottaert (1594), Hans van Alten (1595), Hans de La Torte (1595) and Abraham van Lievendale (1599).