1965 he has written many articles for aviation and defence magazines
in the Netherlands and was co-author of several books. His interest
and research have always been focused on aerial reconnaissance,
Cold War incidents and air intelligence.
the Cold War years 1970-1991 he was Defence Correspondent for
the Dutch national newspaper NRC Handelsblad and contributed
many articles on military, aerospace and intelligence developments.
In 1984 he wrote his first book, Spionage vanuit de Lucht,
about secret NATO and Soviet intelligence flights during the Cold
This book was also published in Great-Britain and the United States
as Aerial Espionage - Secret Reconnaissance Flights by East
and West. Under the same title it was also translated
into Japanese and published in Japan.
His next book was MiG's op de vlucht (MiGs on
the run, Pilot Defectors in the Cold War), the first book
about pilot defectors covering the whole spectrum of aerial defections
worldwide since WW2.
October 2016 he wrote the English language book - The Secret
MiGs of Bornholm - about the Polish pilots who defected
with their MiG-15 fighters to the Danish island of Bornholm and
to Sweden. Many fascinating historical details about the covert
technical intelligence examination of these fighters- never published
before - came from declassified Secret and Top Secret documents.
latest book, De Spionnen van Aeroflot, published
in november 2018, is about spyflights by civil aircraft of the
Soviet airline Aeroflot and other airlines of the Communist Bloc
during the Cold War.