I was born on 03-03-1941 at Lierderholthuis near Heino in The Netherlands.
After the primary school there, I went to the "Thomas à Kempis" grammar school (HBS) in Zwolle.
In 1964, I have obtained my Polytechnical Degree at the Avond-HTS Rotterdam and in 1975 my Master's Degree at
the Delft University of Technology. Both degrees in Naval Architecture were obtained - alongside a full-time job -
by studying in the evening hours and weekends.
I have started my professional career in September 1958 at the Rotterdamsche Droogdok Maatschappij,
a shipbuilding and repair yard,
first by manual construction work in the shipbuilding factory and close on two years later by technical ship design
and construction work in the shipbuilding drawing office of this yard.
Five years later in July 1963, I have changed one's job and became Laboratory Assistant at the
Ship Hydromechanics Laboratory of the Delft University of Technology and
after obtaining my Polytechnical Degree in 1964 I became Technical Officer there.
In September 1964, I had to join Her Majesty’s Army.
After a military training of about 10 months, I became an army air-observer in
Piper Super Cub aeroplanes and Alouette III helicopters at the 300 Squadron at Ypenburg.
After a great time there, I left the military service as second lieutenant in June 1966
and returned to my civilian job at the University.
In 1968, I started my study at the University (alongside a full-time job)
and obtained my Bachelor's degree in 1972 and my Master's degree in 1975.
Then I became Scientific Officer there, some years later Assistant Professor and in 1992 Associate Professor.
During the years 1985 through 1990, I developed privately - as a derailed scientific hobby -
the 2-D ship motions computer code SEAWAY, of which the DOS version was used at over 60 locations.
In total, I have spent almost 10,000 hours on its development and description.
This development was a very useful exercise for me to understand in a detailed way the theory and the practice
of the behaviour of ships in waves.
Since 1984, I was teaching Ship and Offshore Hydromechanics to students of the Mechanical and
Civil Engineering Departments and since 1990 also to students of the Marine Technology Department.
The main topics of my research interests were 2-D frequency and time-domain applications
(in particular potential theories, computing techniques, added resistance, relative motions, speed-loss,
anti-roll devices and fluid motions in tanks), safety and manoeuvring of ships.
From 1981 until 1987, I was Member of the Seakeeping Committees of the 17th
and the 18th International Towing Tank Conference and from 1999 until 2002
Secretary of the Loads and Responses Committee of the 23rd ITTC.
In that time, I have also been an external expert of the European Community
to judge and guide EC-projects on energy saving of ships.
Having worked already for 44 years at the age of 61, then or never,
time had come to do some other interesting things too.
In May 2002, I have made use of the possibility to reduce my official job at the University
to just one day per week.
Without any stress, the greater part of this reduction was used for turning over my office, updating my lecture notes
and carrying out my personal research hobbies with respect to the strip-theory code SEAWAY
and to model and full-scale shipmotion and maneuvering experiments.
Using modern theories and computation facilities now, I had re-analysed a large number of
extensive experiments in these fields, carried out in the past.
Most of these results are published here at the Internet.
Concerning my approaching full retirement,
the computer code SEAWAY had been transferred to the maritime consultancy AMARCON in spring 2006.
Finally, in April 2006 I had retired fully. Together with my wife Leni, I am spending the major part of my time now
to entire other things than hydromechanics.