Jan Martens (born 19 April 1939, in Eindhoven) is a Dutch painter. Jan Martens studied at the Academy of Visual Arts (The Hague, 1954–1959) under the direction of Kees Bol, among others, and at the Jan van Eyck Academy (Maastricht 1961–1966). In the time between the two schooling periods, he made his living as a graphic designer and silkscreen printer. The second degree developed his fine arts skills, and he specialized in painting and sculpture. While a student, Martens spent time travelling abroad and so became acquainted with classical Greece, Islamic Morocco and classical Italy.
https://en.wikipedia.org/wiki/Jan_Martens