Geelen was born in January 1964 in Hilversum as the oldest child of the illustrator Harrie Geelen and the children's author Imme Dros. In 1991, he dropped off his Ph.D. research in Computer Science at the Universiteit van Amsterdam to found a company called Palmtop Software with his former university mate Peter-Frans Pauwels. This company was later renamed TomTom.
- Pieter Geelen. "Pieter Geelen: Executive Profile & Biography - Businessweek". Bloomberg.com. Retrieved 2015-07-23.
- "TomTom founder donates €100.000.000". Turingfoundation.org. Retrieved 2015-07-23.
- "Turing's Legacy – Philanthropy". Theturingcentenary.wordpress.com. Retrieved 2015-07-23.
- "Did TomTom founders just kill the postcode?". Telegraph.co.uk. Retrieved 2015-07-23.
- "The New Yorker - Should Mapcodes Replace GPS". TNewyorker.com. Retrieved 2015-07-23.
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