During his studies he founded (together with Ton Smit) the Venlo chapter of the Nederlandse Vereniging voor Weer- en Sterrenkunde (Dutch association for meteorology and astronomy) on April 18, 1965 (since 1990 known as the Weer- en Sterrenkundige Vereniging "Jean Delsing").

After having lived and worked in the United States and France (both for two years) he became a presenter of Dutch radio and television programmes about science and technology.

He presented popular science programmes such as Wondere Wereld (Miraculous World) and television courses such as Moderne Sterrenkunde (Modern Astronomy) and Nederland en het Weer (The Netherlands and the Weather).

He was an active advocate for science and technology and was often asked as a keynote speaker for events related to these areas, and for theme days on schools and universities.

He also co-initiated the recreation and education park for astronomy and space travel Cosmo Science Center in North Brabant.