J. W. Kaiser along with his associate Ms. Margaretha Hofmans was the driving force behind the Open Veld Conferenties (Open Field Conferences) in Holland which were held from 1951 to 1968, initially held at the Castle "Het Oude Loo," and later continued as "The Open Field" (Dutch "Het Open Veld") providing a symbolic open meeting place for spiritual seekers from all around the world, with the proceedings held mostly in English, German, and French.

Church: The Greek word was ekklesia - a calling out, a gathering - and when Jesus told Simon the Waffler to become the Rock (Gr. Petros) on which he would build his ekklesia, he spoke to all of us through him to accept the Atonement for ourselves, and join with him so he could build in us on the rock of spirit, not on the doubts of the thought system of separation, which was later to be called "the ego." Hence gnosis, knowing is completely free of doubt, as it has our true Self as a referent, and not our false identity as an ego.

The Open Field symbolizes much the same as the Greek Ekklesia, i.e. an open public place in which the faithful congregate upon leaving their homes, and not at all a closed building, that would separate believers from non-believers. Ekklesia means literally to be called out (from your home), and, much like Jesus called the Apostles, to leave their worldly concerns behind and follow him.

Speakers at the Open Field included, besides Kaiser, many leading spiritual and psychotherapeutical authors of the day, including Prof. Martin Buber, Rabbi Soetendorp, Gustav Mensching, Dane Rudhyar, Dr. Hans Müller Eckhard, Joel Goldsmith, Prof. Dr. Gilles Quispel, Linus Pauling, Prof. Dr. Graf Karlfried von Dürkheim, Prof.  Dr. Annemarie Schimmel, Juan Mascaro, Christmas Humphreys and many others.

 In 1993 I published four of JWK's essays in English under the title: Four Open Field Books - these were four presentations he had given at the Open Field conferences, originally in English, but translated back from the Dutch on account of later revisions. In an introduction I accounted for my own relationship with JWK and his work.

In 2003 I published The Gospel as a Spiritual Path, as a more in depth introduction to Kaiser's work, using mostly his own words to explain the main tenets of his work, as well as account for my own experience of how my studies of A Course In Miracles were leading me to a deeper appreciation of the writings of Kaiser, and an understanding of some aspects of them that had previously remained obscure to myself as well as many other students of his work.

Rogier Fentener van Vlissingen