Having already made the memorial plaque for professor Schouten in the IPO building, Reniers was assigned the task of designing two medals: the honorary TU/e Medal (for special occasions) and the Holst Medal, which is awarded on the occasion of the annual Holst lecture.
After dropping out of retail school at sixteen, Jos Reniers joins the Mextal firm as a model builder. In his spare time he is an avid draftsman, and when the Mextal firm fails he applies for work with Vlisco at Helmond, carrying a bundle of his drawings under his arm. Within half a year he makes his mark, successfully making his own fashion designs. In 1969 Vlisco offers him the opportunity to take an evening course at the Academy of Industrial Design at Eindhoven.
After three years his teachers tell him that he 'draws like a sculptor', and it is as a sculptor that he finally graduates. Ever since Reniers switches back and forth from working for the Vlisco company to his work as an independent sculptor in half-year shifts. The salary he earns in a half year's work for Vlisco allows him to take six months unpaid leave during which he can focus on his own designs. Reniers turns 'Time is money' around into 'Money is time'.
At the Academy of Industrial Design he makes his first medals. It is the beginning of a large body of work, with assignments coming from a wide variety of institutions. These include the Rabo Bank and the Kempenland Museum of Regional History at Eindhoven. Reniers works in traditional style, with medals being engraved on both sides, but also chooses alternative approaches.
Jos Reniers' medals often comprise multiple parts connected with hinges, so they may be set in upright position. They feature all kinds of openings and perspectives that correspond in a creative way with the images depicted on them. His designs do not remain unnoticed. In 1992 the Fédération de la Médaille honours him for the best combination of word and image.