Dialexis trains professionals in DBT, guides teams and therapists. Furthermore, Dialexis helps with developing and implementing (the implementation and and organisation) of a DBT program. The training programs are adapted to the needs of mental health care institutions and different target groups.

Dialexis also offers supervision and teamconsultation, which can result in the certification of individual therapists and trainers. Team certification is also possible.

Dialexis is affiliated to Behavioral Tech, the Linehan Institute Training Company.

In addition, Dialexis is acknowlegded for it’s short-term vocational training by the CRKBO.


The board of Dialexis

Hanneke (J.P.A.) van Leeuwen, Msc

Roland (R.) Sinnaeve, MSc

Ursula (U.) Witteveen


The team of Dialexis

Wies (L.M.C.) van den Bosch, PhD

Supervisor, Teamconsultant and Adherence Coder

Anne (A.) Huntjens, MSc

Trainer, Supervisor, Teamconsultant and Adherence coder

Afke (A.) van der Hoek, Msc


Bregje (B.A.) van Laar, Msc

Trainer, Supervisor and Teamconsultant

Ursula (U.) Witteveen

Boardmember, CEO, co-trainer, teacher DBT skills training, Trainer, Supervisor and Teamconsultant

Leen (L.) Dobbelaere, MSc

Trainer, Supervisor, Teamconsultant and Adherence coder

Nienke (N.) de Ruiter

Trainer, Supervisor, Teamconsultant and Adherence Coder

Jacomijn (J.P.) Jacobs

Co-trainer, Supervisor, Teamconsultant and Adherence Coder

Hanneke (J.P.A.) van Leeuwen, Msc

Board Chair Dialexis, Trainer, Supervisor, Teamconsultant and Adherence Coder

Karin (C.J.) van Dam, MSc

Trainer in training, Supervisor, Teamconsultant and Adherence coder

Roland (R.) Sinnaeve, MSc

Board member, head of training and development, trainer, teamconsultant, adherence coder

Marjan (M.) Welink

executive assistant

Klaas-Jan (K.J.) Pos, Msc

Trainer, Supervisor, Teamconsultant and Adherence Coder


Review by: Yoray Barak

A review of Marsha's autobiography has been written by Yoray Barak. Click her for: review from Marsha's autobiografie.

Train de Trainer

Skill trainer is a profession! Therefore this specialized developed training. You can still register! Click here    

Change at new year

We wish everyone a happy New Year! Starting the new year there will be a new change at Dialexis. We want to thank Gabrielle Gortworst very warmly for

Book launch

On December 13th, 2019 an interesting book is published! The “Handbook on antisocial behavior and personality disorder” at the picture presented by the three editors; Madeleine Rijckmans, Arno

Introducing two board members

We are happy to introduce Hanneke van Leeuwen and Ursula Witteveen as two of our board members. Hanneke is researcher, DBT therapist and trainer. She gets involved in

New board member

We have good news! Ursula Witteveen has become board member of Dialexis. In addition to her responsibilities as board member, Ursula is taking over the business operations of

New trainers in training

This year, the team of trainers will be further expanded with two new trainers in training. We are proud to announce that Afke van der Hoek and Bregje van

International cooperation

The first week of the intensive training of the Linehan Institute in Moscow was ended with an “around the world handshake”. André Ivanoff led this training together with

Renewal at the secretariat

Dialexis has a new employee at the secretariat since October 15th! Gabriëlle Gortworst joined Dialexis and she is Applied Psychologist. Besides, she is currently studying for a Master's

Publication article

Today a new research article, written by amongst others board members Roland Sinnaeve and Wies van den Bosch, has been published in the journal Borderline Personality Disorder and Emotion

Trainers meeting in Seattle

Roland Sinnaeve and Wies van den Bosch are currently on the road to Seattle for an international trainers meeting of the Linehan Instituut! During this meeting they will,