- Jan Jansen is father of Janine Jansen
- He is the former cantor and organist of the Oude Kerk in Soest.
- He was awarded the Prix d’Excellence for organ in 1970
- From 1987-2011 he was principal organist of the Domkerk in Utrecht
- He also played in the weekly Zaterdagmiddagconcerten in the Domkerk with the Domcantorij under the direction of Remco de Graas
- He is a highly sought-after harpsichord and continuo player
- He was teacher of general theoretical subjects at the Utrechts Conservatorium
- In 2011 Jan was appointed Ridder in de orde van Oranje-Nassau