About Marianne van Oosterhout

I support ambitious professionals and managers in healthcare, science and biotech who are held back by uncertainty, a lack of psychological safety or ineffective leadership patterns. With over twenty years’ experience within healthcare organisations, I understand the pressures and complexities of these sectors from the inside.

As an internationally certified coach (PCC, ICF), I have clocked up more than 2,300 coaching hours and have supported hundreds of clients. I work with methods including the Leadership Circle Profile®, Positive Intelligence®, Co-Active coaching, and stress and burnout coaching techniques. This enables me to quickly identify patterns and work in a targeted way towards sustainable changes in thought and behaviour.

Clients describe my coaching as warm and incisive, delivering lasting results in terms of self-confidence, leadership and impact.

Overcome uncertainty and psychological unsafety in your work

In my individual coaching, I work on what holds you back at work: persistent patterns of insecurity, perfectionism, people-pleasing, conforming or keeping quiet. When you don’t feel safe to speak your mind or show your true self, this leads to stress, tension and the feeling that you’re never quite able to fulfil your potential.

In our team coaching, we identify limiting patterns so that they can be broken. You will enhance your personal and professional effectiveness by building mutual trust and a psychologically safe working environment. Within this environment, you will continuously develop yourselves and one another, making the most of your own wisdom and potential. With strong leadership in which everyone is seen, heard and valued. Everyone has a personal and equal say and makes a difference. Coaching and proven methodologies serve as a starting point to get straight to the heart of the matter. And to work together in a focused way towards your goals in a cyclical process.

My core values

My core values serve as the compass by which I navigate: in the choices I make, how I act under pressure, and what I expect of myself and others.

Authenticity

For me, authenticity is a daily choice: being who I am, even when it feels uncomfortable. Knowing and acknowledging my shadow sides. Acting in line with what I believe, even when no one is watching. Showing my vulnerabilities without hiding them behind a role or a mask. That takes courage. And honesty, especially towards myself.
Because as soon as people stop putting on an act, space is created, along with a way of leading that those around you can sense and respect.

Courage

Showing courage means taking a risk. The French word for courage is ‘courage’, and it contains the word ‘coeur’: heart. Because, for me, being courageous means letting my heart speak at times when things get tough. Owning up to a mistake. Speaking out when something is at stake that affects me deeply. In doing so, I expose myself. I don’t know how the other person will react – with rejection or loss. And yet I choose to do it because remaining silent costs me more than speaking up.
I ask the same courage of my clients. It’s not easy, but it’s very rewarding. Those who learn to speak from the heart, even when things get tense, discover a strength that was always there.

Integrity

Integrity means doing what I have promised. Living by my values. Being reliable, both for others and for myself. Acting openly and honestly, and always seeking a way forward and an outcome that benefits everyone.

Connection

True connection begins from within. Mind, heart and gut all pointing in the same direction. Knowing what I feel. Feeling what I know. And knowing what really matters. That inner alignment is the foundation. By staying true to my own values, I make choices that feel right.
For many of my clients, this is a revelation. As soon as they learn to listen to those three layers, they take more conscious control of their own path and life.

Rating

Appreciation starts with yourself. For who you are. What you have learnt and what you have endured. Appreciation for the people around you. The Esperanto word ‘aprezo’ means appreciation. A language devised to connect people across borders. It suggests that appreciation is a way of looking: at yourself, at others, at what is already there.

Compassion

Feeling compassion for yourself and for others, with empathy, understanding and without judgement. This word contains two elements: ‘compass’: to set my course in terms of who I want to be and what I do as a result. Connected to my values. And ‘passion’ for people, their development and their connection with themselves and others.

Leadership starts from within, with yourself.

Powerful leadership stems from self-awareness, honesty and a willingness to take difficult questions and reality seriously. I myself have been going through that process for years, and it won’t stop until I’m six feet under. Growth in leadership is a lifelong learning journey, for anyone who is willing to embark on it.

Testimonials

4 / 5

7 reviews

Marianne is a very pleasant and knowledgeable coach, with whom I feel very much at ease. I’ve been seeing her for a number of years now and am very satisfied with the way she coaches me. She connects well with who I am and with my questions, and she challenges me to reflect and take action. I’ve learnt a great deal from her over the past few years.

Judith Uiterwijk

After a hectic period at work where I was thoroughly criticised by a director, I lost my self-esteem. Thanks to Marianne’s support, I managed to get back on my feet and learnt to stand up for myself better. I was also inspired by an excellent leadership training course.

Marcel van den Eng

Marianne is a warm and empathetic coach who holds up a mirror to you in a positive way. With her, you feel safe and understood, even when confronted with deeper, often unconscious patterns. She guides you with care to become aware of these patterns and helps you let go of habits that aren’t working. Thanks to the full programme I completed with her, I have made noticeable and lasting progress in my mental health.

Frank de Jongh, doctor

I’m glad I chose Marianne and followed my intuition. I’m most grateful for her recommending the book *Positive Intelligence* by Shirzad Chamine. Inspired by this book, I started the online Mental Vitality Programme, and my coach, Marianne, guided me through it. I am also very satisfied with the way she helped me gain insight into my own strengths and qualities. I also really appreciated that Marianne took the initiative to check in with me from time to time to see how I was getting on and also drew my attention to practical matters.

C.E.

Thanks to our fruitful conversations, I soon realised that I’d taken on too much (both at work and in my personal life). It turned out I was suffering from burnout. Marianne was a great help to me during this difficult time. And the great thing is that Marianne is also very adept at adapting and can intuitively sense what is important and necessary at any given moment. Marianne has given me many insights on a number of points, which I find very valuable and which can bring me even closer to my goals in the future.

M.S.

Marianne’s team coaching has made a very positive contribution to team spirit. Team members are more aware of their communication patterns, and communication amongst the team has improved significantly. We now engage in much more dialogue with one another and are working constructively to improve our collaboration.

CK, Director

I’ve been seeing Marianne for years, and that really says it all. She has taught me to reflect: to pause where I used to rush straight through, and to look at situations through different eyes. In quiet periods, she gets me thinking; in challenging times, she brings calm.

What makes Marianne special is her combination of genuine commitment and professional expertise. She listens without judgement, asks exactly the right questions and provides practical tools that you can really put to use. Even between sessions, she continues to think alongside me and shows genuine empathy.

Over the years, I’ve developed thanks to our collaboration, both personally and professionally. I can wholeheartedly recommend Marianne to anyone who wants to grow further, reflect and take concrete action themselves. It’s simply a matter of taking a good, long look in the mirror with someone who guides you through the process with warmth and expertise!

Gert Kornet

“I’m so glad I found Marianne at a time when I really wasn’t doing well. I was incredibly tired, couldn’t think clearly any more and didn’t really know how to carry on. Things were very hectic at work and my private life was on autopilot. I just didn’t know what to do anymore. I confided in Marianne and she never betrayed that trust. She guided me in very small steps. At first, I really didn’t know the answers to her questions; my head was too full to think properly, but bit by bit, space opened up to consider how certain things needed to change. Both at work and in my own mind. Certain thoughts and habits have become so ingrained, yet sometimes they’re not good for you. Marianne confronted me with this and helped me realise it.

I really wanted to get ‘better’ again, so I took this programme very seriously – and it worked! Creating a new daily routine, dealing with thoughts differently, building in moments of calm, setting and maintaining boundaries, finding and drawing on my inner leader – I could list so many things that are now going so much better and bring me peace of mind. Now that I’ve had a chance to reflect on it, I realise just how much progress I’ve made, and I’m genuinely so happy about that! I’ve now completed my programme, but I know I can always turn to Marianne, and that’s a really lovely and reassuring feeling!

Melanie Clemens

I have taken part in many different self-empowerment courses, but I have never had such a life-changing experience as with Marianne!
I deliberately call it an experience as it goes far beyond coaching. The sessions include so much more than I had expected when I signed up for her coaching programme. With her enthusiasm, professional attitude and a sort of ‘superwoman’ radar, she always asks the right questions to establish clear goals for each session, no matter what area it relates to. She combines kindness with firmness in a remarkable way to achieve the best results, even without knowing in advance what those results will be or which direction to take.

Karin Oversloot-van der Zel

Coaching with Marianne van Oosterhout is not just an investment in yourself; it is also a gift to yourself. Sessions are always a combination of intensive work and moments of calm.

Intensive, because coaching with Marianne involves a – sometimes profound – confrontation with conscious and subconscious patterns and beliefs, exploring where they originate and how they influence you. It also involves hard work to internalise new patterns. This simply cannot be achieved without a bit of trial and error.

Finding peace, because Marianne creates an atmosphere in which you are allowed to be yourself, with all your quirks and struggles, and can focus on what you need at that specific moment to continue growing.
The reason this can coexist within coaching sessions is that Marianne combines thorough professionalism with a high degree of personal commitment, which extends beyond the sessions themselves.

Coaching with Marianne is therefore the most valuable gift you can give yourself.

JMG

Although I am a highly qualified coach and mentor myself, I have benefited greatly from Marianne’s intuitive and compassionate coaching and mentoring on a number of occasions over the past few years.
I have no hesitation in highly recommending Marianne for her insights, particularly in leadership and personal development. You’ll be glad you chose Marianne’s support.

Linda Ambrose

Psychologically safe and powerful leadership. That is what I stand for every day.

I guide professionals and managers in healthcare, science and biotech towards greater self-insight, decisiveness and a working environment in which people can truly flourish. I ask the questions that stick with you. I hold up a mirror. And I challenge participants to face up to patterns of self-doubt, perfectionism or the urge to control. That takes courage.

Are you brave enough? Then you’ve come to the right place.

Psychological safety is the foundation on which everything grows.

I have been working as a coach and trainer for over 12 years. I work with people who are intelligent and driven, yet find themselves stuck. They notice that the atmosphere in their team is tense, that there is a lack of openness, and that staff are losing energy due to a toxic working environment. And they are unable to make full use of their talents. I often recognise in their stories exactly what I used to experience regularly in my own work. And I’m convinced that a psychologically safe working environment is essential for anyone who wants to excel and for any team that wants to perform well through collaboration. That recognition means I know exactly what you’re going through, and what you can do to break through it.

More than 2,300 hours of coaching with hundreds of professionals and managers have taught me how space is created when people feel truly heard. How someone discovers their potential. And actually takes steps forward.

Interested?

Book a no-obligation introductory meeting

Does any of this sound familiar to you? In a half-hour, no-obligation chat, we’ll explore together what’s going on and whether coaching is right for you. No sales pitch – just a straight-to-the-point question right from the start.

Leadership starts from within, with yourself.

Quality and continuous development are crucial.

I am accredited as a Professional Certified Coach (PCC) by the International Coaching Federation (ICF). Over the years, I have completed numerous courses and training programmes. I regularly participate in peer review and supervision to ensure I remain sharp and continue to develop myself as a practitioner in my field.

My training and certifications:

Accreditation: PCC, International Coaching Federation (ICF) (2020–present)
Presencing, Theory U, MIT (2025–2026)
Mastering the Art of Facilitation (2025)
Certification in Neuroscience and Transformational Coaching (2024–2025)
LCP Pulse Certification (2024)
Leadership Embodiment (2024)
Leadership Circle Profile & Collective Leadership Assessment Certification (2018–2019)
Organisation, Relationship & System Coaching (ORSC) (2016–2017)
Specialising in stress and burnout coaching using the CSR method (2020)
Co-Active® Coaching Certification (2018)
Co-Active® Leadership Programme (2015–2016)
Training as a Positive Intelligence Coach
The Outward Mindset, Arbinger Institute (2018)
Unmasking Discovery and Mastery, Dr Okokon Udo (2015–2016)
Master’s degree in Health Sciences, Maastricht University (1996)
HBO-V, Leiden (1986)

Guaranteed professional coaching in accordance with the professional code of conduct

What does this mean for clients and/or their employers?

The code of ethics safeguards privacy and governs the separation of interests.
Complaints about me as a coach can be submitted to an independent complaints committee of the ICF.
As a professional coach, I meet strict entry criteria. Through continuous professional development, I continually enhance my skills via accredited training courses, peer supervision and keeping up to date with specialist literature.
As I am a member of the ICF, I am listed and recognised on their website, so that clients can verify my credentials.

Collaboration

Working together on team coaching and training sessions is extremely rewarding, enjoyable and inspiring. We delve deeper into issues and do not shy away from discussion in order to develop the best possible programme for our clients, ensuring they make real progress. During team coaching and training sessions, we ensure that both the content and the group dynamics are given their due. That is why I collaborate with a network of fellow coaches and trainers, as well as with coaching agencies. These include Ronald Berkhuizen, Annette Lechner, Irène Everaert, Bertine Brouwer and Gingermood. I’m also part of various peer review groups so that we can learn from and support one another.