Hans Montanus has been a professional mathematics teacher for almost 30 years. In 2017 he received his PhD in Physics from the University of Amsterdam with a study on The Observability of Jets in Cosmic Air Showers. He has a wide interest in many areas of Physics and Mathematics.
Ron Westdijk worked for more than 30 years as programmer, project/portfolio manager and IT manager in the tourism industry. His main interests are mathematics in general and programming in Mathematica in particular.