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Sylvia Mastenbroek
Board member | Co-owner
Sylvia has a background in clinical psychology and academic research. Together with her partner, Manfred van Doorn, she leads team…
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Manfred van Doorn
Keynote speaker | Leadership trainer | Author | Board member
Manfred is an internationally active leadership trainer, offering training courses for directors in England, Ireland, Belgium, Germany, Poland, Canada, and…
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Michiel van Hattem
Board member
Michiel studied at the KMA in Breda, Business at the Erasmus University in Rotterdam, and received his MBA at the…
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Isodoor Jonker
Operations manager | Leadership trainer
Isodoor has been working at Double Healix since 2010. He is operational manager of the organisation, Certified Double Healix trainer,…
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Victor van Doorn
Leadership Trainer | Consultant
Victor is a true entrepreneur and works as an advisor to Double Healix. He started and leads various businesses, such…
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Khalid Kasem
Leadership Trainer | Legal advisor
Khalid is originally a lawyer. He works as an advisor and trainer to big businesses and organisations, both nationally and…
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Manfred van Doorn
Keynote speaker | Leadership trainer | Author | Board member
Manfred is an internationally active leadership trainer, offering training courses for directors in England, Ireland, Belgium, Germany, Poland, Canada, and…
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Rozemarijn Dols
Leadership Trainer | Author
Rozemarijn studied Social and Work and Organisation Psychology. In the years following her studies, she continued her education, taking courses…
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Marcel Karreman
Leadership Trainer | Author
Marcel is a senior trainer in change trajectories and leadership programs in the Netherlands and internationally. He guides teams in…
Read moreIsodoor Jonker
Operations manager | Leadership trainer
Isodoor has been working at Double Healix since 2010. He is operational manager of the organisation, Certified Double Healix trainer,…
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Sabine den Hartog
Leadership Trainer
Sabine den Hartog Sabine began her career as Work & Organisation specialist at KLM Arbo Services. Having graduated in the…
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Alexander van Velzen
Leadership trainer
Alexander has extensive experience in guiding change processes within various (inter)national organizations. In his role as consultant, facilitator and (executive)…
Read moreVictor van Doorn
Leadership Trainer | Consultant
Victor is a true entrepreneur and works as an advisor to Double Healix. He started and leads various businesses, such…
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Iris Deuss
System therapist
As a system therapist, Iris focuses mainly on restoring relationships. The relationships between family members, partners, (divorced) parents, extended family…
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Peggy Grefkens
Trainer | Coach
Peggy is a clinical psychologist and she has worked in the healthcare department for a long time, the last few…
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