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Marlies started her consultancy in 2005 with three objectives in mind: to uncover the strengths and capacities already within client organizations; to help organizations develop appealing narratives for their stakeholders; and to bring a high quality infrastructure to ensure that the changes that are needed within organizations are enabled. Over the years she has broadened her approach as she realized building strong relationships with external stakeholders was only half the job - internal relationships, motivations and drivers, also needed to be attended to. She now works with her clients across this continuum, from external stakeholders to internal stakeholders. 

Her experience, empathy, and decisiveness enable her to build bridges: Between sometimes conflicting cultures and interests; between internal and external stakeholders; between strategy and practice; and between the boardroom and the business. 


  • Founder and owner of BY TRUST

  • Chair Supervisory Board of the Dutch Brain Charity Foundation (Hersenstichting)

  • Member Supervisory Board and Chair of the Remuneration Committee of the government funded Preventive Ovarian, Breast and Colon Cancer Screening Organisation

  • Publication research: Culture, Behavior and Reputation for Supervisory Boards

  • Member of the Advisory Board of the Admiral Michiel de Ruyter Charity Foundation

  • Head of marketing communications department at TNT International, lead various (inter)national client teams and was on the board of agency Ogilvy.

  • Member of the ‘Ambassadors Network’ (2005/2006), a network of Dutch CEO’s committed to advance women to top positions. Involved in various initiatives to empower women.

Marlies also brings to the table her global agency experience, wide sector knowledge, strategic imagination and a capacity to quickly get to the essence of complex issues. She is dynamic and enterprising and aims to build long lasting relationships with clients. Her various positions as Supervisory Board Member inspired her to publish on the subject of integration of culture, behavior and reputation in the modus operandi of supervisory boards. 

‘When trust issues are resolved, quality happens at all levels.’


BY TRUST is a typical new economy network consultancy. Our teams range from 2 to 15 specialists to successfully answer the questions and objectives put to us. Independent thinkers in the area of organization development, coaching and cultural change, stakeholder dialogues, identity and reputation, communication and branding.

We bring to the table our wide sector knowledge, strategic imagination and capacity to quickly get to the essence of complex subjects. We are known for our results-based approach. We all share the same drive and service mentality to bring assignments to success.

BY TRUST supports and guides, from decisions taken in the boardroom through to implementation in the workplace, this way we lead companies through the necessary transition, both within the company and in the market place.