Wilberd Leo Johan van der Kallen (born 15 January 1947 in Nieuwer-Amstel)[1] is a Dutch mathematician.
W. L. J. van der Kallen completed his undergraduate study of mathematics and physics at Utrecht University.
[3] In 1969 Van der Kallen became a teaching assistant in Utrecht University's Mathematics Department and has spent his career there, eventually becoming a tenured professor.
He has frequently been a visiting professor at Northwestern University in Evanston, Illinois and at the Tata Institute of Fundamental Research in Mumbai.
[6] In 1978 Van der Kallen was an invited speaker at the International Congress of Mathematicians in Helsinki.