works for many years in the development of educational bridge software. More than 20 years ago his first program was released which was made in cooperation with the formal Dutch world champion Berry Westra. This software (Progress) is still successfully published by Alpha Bridge in The Netherlands and many people learn to play bridge with the help of this software. Even the more experienced bridge players will become a better partner/opponent after using this software.
After the first program new programs followed. The programs are made in collaboration with the top players as Mike Lawrence, Andrew Robson, Berry Westra and Marty Bergen. Apart from being world champion, they all are excellent authors and teachers.