John served in the Armed Forces for 37 years, of which 24 in the Intelligence and Counter-Intelligence Services. His core activities were accentuated at terrorist organizations such as the Baader Meinhoff Group, the IRA and the Rote Armee Fraction. His last position during this Government tenure was Chief Industrial Security of the Ministry of Defense. For certain specific services to his country the Queen of the Netherlands, Juliana of Orange Nassau, awarded John a rank in the Knighthood of Orange Nassau in 1977.
After leaving the services John operated in the commercial industry for 23+ years, having positions as CEO and MD of Risk Management Companies and his own Security Consultancy Company. During this tenure John was living and working in the Middle East and operated as well in Asia and North Africa. His work was accentuated at terrorist organizations such as Al Quada, the Moslim Brotherhood, Hezbollah, Hamas and others.