About Synthesis

Synthesis offers an exclusive 3-day psychedelic retreat in Amsterdam to forward-thinking individuals who want to utilize moderate-to-high doses of psilocybin truffles to catalyze creative breakthroughs, deepen self-understanding, and muster the courage to make the next big ‘leap’ in life.

When used within a modern, legal, medically supervised and structured framework, it is one of the only modalities that creates dramatic, impactful change within just hours of utilization.

We administer the truffles in a unique way to eliminate physical discomfort and nausea. Then, taking into consideration your intention, sensitivity, and previous experience, we then optimize the best dosage for you. Finally, we integrate the latest findings and best practices from the psychedelic research community to ensure your experience is as profound and effective as possible.



Our vision

Synthesis will pave the way in facilitating research about the efficacy of psychedelic medicine on facilitating optimal body, mind, and spiritual wellness. By combining psilocybin with other modalities (sound meditation, yoga, and breathwork, etc.) and measuring outcomes for well being, we will build a database of optimal mind-body approaches to healing. We plan to develop this research framework as emerging technology in blockchain, personalized medicine, and big data become more available.



The Synthesis Team

Your Facilitators:


Natasja Pelgrom

Lead Facilitator

Natasja has a successful track record in creating several companies in the hospitality, events and fashion industry. Today she is a Holistic Transformational Mentor with significant experience in counseling; life and business coaching with over ten years of practice.

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Tessa Van de Ven

Lead Facilitator

As a former travel guide, Tessa is currently focused on how to weave indigenous wisdom traditions and modern research results into guiding principles for psychedelic experiences and the journey of integrating insightful experiences.


Paul Austin

Co-Founder & Director of Business Development

Founder of The Third Wave, Paul is this generation’s leader for utilizing micro and moderate doses of psychedelics for personal and professional development. In developing Synthesis with Martijn, Paul has committed to creating a legal container to initiate lasting change and transformation in your personal and professional life.

Martijn Schirp

Co-Founder & Managing Director

Co-founder of High Existence, Martijn first reached out to psychedelics when he was in search of new perspectives and clarity to reorient his life. With Synthesis he aims to make psychedelic tools accessible in a safe, legal, and wider context.

Myles Katz

Director of Operations & Finance

Myles has played key roles in launching and leading 5 VC-funded startups for the past 8 years, with a range of operational and financial experience focused on technological, socially responsible, and green initiatives. He joins the Synthesis team from Kenya, where he helped build a 30-person team and raise over $3m USD to help commercialize a new agricultural commodity.

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Kristyn Judkins

General Counsel

Kristyn oversees legal matters for the Synthesis team.

She joins us from a global law firm where she focused her practice on dispute resolution and complex international tax and corporate transactions. A few psychedelic experiences of her own fueled a desire to help our community.