Lensen is a Dutch sports director with more than 20 years experience in professional football. In the first 15 years, he held various functions at the Royal Dutch Football Association (KNVB). During this time, Lensen founded the youth football training scheme and was closely involved in the technical aspects of the sport within the organisation. In addition, he was the author of two KNVB booklets "4 against 4" and "7 against 7". From 1985 till 1988 Lensen was initially an assistant to the Dutch under 15 and subsequently the head coach at the time the team reached the final of the World Cup in France; He also was the assistant of the Dutch squad under 16. Lensen was a member of the support staff of the winning Dutch team (the legendary squad of Rinus Michels, Ruud Gullit, Marco van Basten, Frank Rijkaard et al.) during the European Cup in Germany in 1988.
In the period 2000–2005, Lensen was the head of youth training and education at AZ in Alkmaar; There he was, amongst other things, responsible for setting up the LOOTschool, a structure which ensured a combination of training and education. After this period, Lensen became head of youth training and head (international) scouting at Fenerbahçe SK. Lensen currently continues to act as a guest lecturer and advisor to various parties including the Royal Dutch Football Federation and the Turkish football association (Turkiye Futbol Federasyonu).
