From University of Michigan:
"Earlier today, John D. MacArthur Professor Emeritus Martinus Veltman (1931-2021) passed away peacefully at his home in Bilthoven, The Netherlands, surrounded by his family. Professor Veltman was part of the University of Michigan faculty from 1981 until his retirement in 1996. He shared the 1999 Nobel Prize in Physics with his Ph.D. student and collaborator Gerardus t'Hooft for demonstrating that Yang-Mills gauge theories with spontaneously broken symmetries are renormalizable. The most important such theory is the Standard Model. This work enabled decades of increasingly precise Standard Model predictions to be tested experimentally at facilities like SLAC, Fermilab, and CERN. "