A Unique Team with a Unique Vision

Synthesis offers legal, medically supervised, and scientific based psychedelic retreats in Amsterdam. We make the psychedelic experience accessible for curious individuals who want to utilize moderate-to-high doses of psilocybin truffles to catalyze creative breakthroughs, explore consciousness, find meaning, improve confidence, and search for a mystical experience. Find out here what our customers say about us.



Synthesis spearheads a new era in the integration of psychedelics into modern culture. In carefully curated settings, these remarkable molecules can be agents of transformational experiences. They can restore our sense of wonder, and foster a renewed sense of connection; to ourselves, others, and the natural beauty of the wider world.

“Our name is a tribute to our core mission; to catalyze synthesis between modern research, ancient shamanistic rituals, and spiritual practices through the ages, bringing these together to create a recipe for transformative wellness. ”

Through ritual and ceremony, open dialogue, bodywork, meditation, the power of sound, psychedelic education, and through the guidance of professional facilitators, psychedelics have the power to restructure thoughts, sharpen perceptual lenses, and awaken new forms of consciousness. This sense of possibility is what you will discover at Synthesis; a locus for true transformation and expanding horizons.

Lead Retreat Team

Natasja Pelgrom

Spiritual Care | Lead Facilitator

Natasja has had a vibrant, traditionally professional, career, directing multiple companies and working variously in fashion, hospitality, and events ‒ but she started to show an aptitude for her current role as a Holistic Transformational Mentor at a young age.

Throughout her professional development, she maintained strong ties to her innate sense of spirituality, by concurrently studying energy healing, Reiki, ThetaHealing®, emotional freedom techniques (EFT), neuro-linguistic programming (NLP), and till today receiving sacred teachings from Native American and North European Shamanistic lineages.

She is a highly intuitive guide and has trained, assisted and facilitated in 500+ psychedelic ceremonies. As a medicine woman operating internationally, she curates medicine retreats, teaches empowerment workshops and developed a psychedelic integration and Self-Love program.

Daan Keiman

Daan Keiman

M.A. Spiritual Care | Lead Facilitator

Daan holds an MA in Spiritual Care and previously worked for the renowned mental health care and addiction research institute, the Trimbos-institute. His experience with guiding and caring for people in altered states of consciousness spans over a decade.

He draws from his personal contemplative practices, psychedelic research and his professional experiences to create compassionate and powerful containers for personal transformation. As an avid explorer of consciousness, he is highly capable of guiding others through the landscapes of the mind.

James Clifton

James Clifton

Integral Psychotherapist & Counsellor | Lead Facilitator

For more than 3 decades James has studied many of the world's perennial philosophies and engaged fully in a number of the great wisdom traditions, with specific interest in non-ordinary states of consciousness.

Trained formally in transpersonal psychotherapy and integral coaching and working with trauma and addiction, he is experienced at tracking tension and points of change and growth in individuals and groups. This unique experience allows him to fully understand the role of psychedelics and entheogen’s as a catalyst for authentic transformation.

Tessa Van De Ven

Tessa Van De Ven

Co-Lead Facilitator

In her role as co-lead facilitator, Tessa takes individuals on introspective journeys to connect with their true authentic self. Psychedelics entered her world when she experienced a challenging identity crisis and sought out nature-based healing modalities.

This exploration of self-healing led her towards various traditional and modern psychedelic ceremonies working with skilled guides and studies in the transformative potential of natural compounds. Tessa's strong intuitive abilities, empathy skills and deep connection with psychoactive plants make her an excellent guide on your journey through expanded states of consciousness.

Lorraine Glatigny

Lorraine Glatigny

Co-Lead Facilitator

This Western healer began her work with Shipibo traditional medicine in 2008. During a one year initiation she learned techniques from a variety of expert healers, where she performed several diets and long stays in the Amazon rainforest. She also spent several months with various traditional Filipino healers who passed on ancient practices of healing, such as the "Hilot" therapeutic massage. From there, she went to meet the Queeros, the last Peruvian Andes descend from the Incas and lived among the Tao't Batu (people of the rock) in the Philippines.

As part of her initiation into shamanism, she realized that she needed to deepen her connection with her divine feminine, in order to understand what constitutes the essence of feminine nature, and to find the "wild" woman within her. Her exploration of the feminine energy with the guardians of the divine feminine, drive her today to share this knowledge with western women in order to help them to listen to their body and femininity.

Sven Kimenai

Sven Kimenai

BSc. Psychobiology | Assistant Facilitator & Breathwork Coach

Sven has a background in Psychobiology & Supplement Development. After his studies, he went on a path of exploring science-based methods for self-healing. He became a Wim Hof Method Instructor, a Breathwork Facilitator and started studying Psychedelics for transformational healing.

He emphatically empowers others to step out of their comfort zones and supports them in exploring their inner landscapes. His aim is to research and apply psychedelics and breathwork, to catalyze personal growth, insight & human connection.

Marta Kaczmarczyk

Marta Kaczmarczyk

MSc Cognitive Science | Assistant Facilitator

Marta is a cognitive scientist (MSc) who has been exploring the concept of the mind from the perspective of science but also Jungian psychology, mindfulness, and somatic therapy.

She co-founded a non-profit psychedelic-oriented community platform and has been giving lectures on psychedelics, focusing on informed use and harm reduction.

Additionally, Marta is a biohacking consultant and a psilocybin truffles guide. In both of these activities, she supports people with the opening to the message of emotions and feelings, to find a fuller life.

Dorien Nagler

Dorien Nagler

Retreat Assistant & Breathwork Coach

Dorien is a woman of breathwork. With this powerful tool, she helps people to connect to their inner being and guides them to the place where they feel at home with themselves. For as long as she can remember, she had this sense of wanting to know what it means to be truly alive.

When she stumbled upon breathwork, she knew she had found something special. Breathwork gave her a new perspective on life and made her understand herself on a profound level. Through the expansion of breath and body, she guide others towards their full potential.

Roos-Veerle Krijnen

Roos-Veerle Krijnen

BSc. Psychology | Retreat Assistant

Roos-Veerle is a Psychologist and Yoga teacher. She facilitates Life-Coaching (Acceptance and commitment therapy), workshops and retreats in the field of physical, emotional, mental and spiritual wellbeing.

Since she was little she has been fascinated by what makes people happy and healthy. Traveling around the world for 2,5 years, meeting people who have had radical remissions, studied and worked with medicines coming unrefined from nature, gave her many insights.

“It all comes down to consciousness, that’s what is healing, and it is to be found within you”, she says. Roos-Veerle brings with her warmth and strong presence, a safe place for you to let your next step in life unfold.

Odin Pepper

Odin Pepper

Retreat Assistant

Odin is a Dutch-American, born and bred in Amsterdam. For the past decade, he has worked as a cinematographer after earning his Bachelor of Arts degree at the Dutch Film Academy.

For the past few years, he has been on a path of self-exploration, self-development, healing, and trauma processing. He has been exploring different modalities and methods like tai-chi, reiki, the healing properties of psychedelics like ayahuasca and psilocybin containing truffles, meditation and different forms of movement therapy. He's recently completed a 2-year intensive course as a certified AuraTouch practitioner.

Medical Team
Emily Kulpa

Emily Kulpa

Pharm.D. | Director of Medical Screening

Emily is a licensed clinical pharmacist with a background in medication therapy management. She is highly experienced in conducting comprehensive medication reviews and medication reconciliations focusing on optimizing therapeutic outcomes.

She received a B.S. degree in Biology from the University of Wisconsin and earned a Doctor of Pharmacy degree from Concordia University Wisconsin. She is passionate about health, wellness, and the healing potential of psychedelics. Currently, she is involved in microdosing research at the University of Toronto Center for Psychedelic Studies by serving as head pharmacist.

David de Wied

David de Wied

MSc. Clinical Psychology | Medical Screener

David graduated from Utrecht University in the fields of Clinical Psychology and Cognitive Neuroscience. His research has been focused on set and setting factors such as the role of music and the effects of different social and physical contexts on the psychedelic experience, a collaborative project with Imperial College and the Psychedelic Survey.

At Synthesis he performs exploration calls and is a member of the medical screening team, utilizing his clinical expertise in helping determine if people should come attend the retreat. David is particularly fascinated by visionary experiences and cognitive changes from psychedelic experiences, as well as finding the right therapeutic approach to work alongside these medicines.

Corporate Team
Melissa Watkins

Melissa Watkins

Operations Manager

Melissa has a broad background in operations. Before joining Synthesis, she managed a luxury diving resort in the Philippines, supported a large scale IT implementation in a Dutch hospital, and earned her stripes as a project manager at an international marketing agency.

With over 10 years of personal experience working with psychedelics ceremonially, she’s bringing her process management and coordination skills to Synthesis.

While not oiling the wheels in our corporate office, or holding space during our retreats, Melissa is working towards her degree in Psychotherapy, specialising in embodiment, sexuality and psychedelic-assisted therapy.

Austin Piedmont

Austin Piedmont

Digital Media Manager

Working for his first start-up while still in high school, Austin prides himself in his creativity and storytelling abilities. Being a hands-on learner, he taught himself skills such as web design, photography, videography, and graphic design - to name a few.

When he's not working, Austin spends his time with his beautiful wife and three children. His hobbies include ju jitsu, video games, and reading philosophy. He also volunteers at the organization he founded, The Collective Unconscious, which focuses on improving the psychological well-being and development of university students.

Jakobien van der Weijden

Jakobien van der Weijden

Customer Service Manager

Jakobien is a Media Studies graduate and former marketer who has been in service of the psychedelic renaissance since 2003. She co-founded a microdosing information platform and has been part of several psychedelic research organisations in the Netherlands.

At Synthesis she supports our attendees on their pre and post retreat journey. When not connecting with you for your exploration call or running corporate operations, she is a Holistic Health Coach in training. She has a strong belief that through the therapeutic use of psychedelics we can activate our inner healing intelligence.



Financial Controller

Ethan is the financial controller at Synthesis. Over the past 15 years, he has worked in the private sector managing community-based projects for start-ups, state and federal government projects in the U.S. Ethan is especially passionate about conscious organizational strategy in the psychedelic space, financial modeling and providing data-driven insights to inform strategic, financial, and operational decision-making across the company.



Venue Manager

Former Motorola Ltd Commercial Director Europe Middle East and Africa. Maria left the corporate world in 2009 on a two year sabbatical which led her to study Arabic in Yemen, play polo in Argentina and launch her first start-up JAM Language. During the decade that followed, Maria lived in United Arab Emirates, Mexico, Jordan, Yemen, Spain, Argentina and Brazil where she co-founded the events company SPNM.

Afterwards she detached from all material belongings other than two suitcases as a digital nomad living between Europe and South Africa for four years chasing the summer. This period led her down a road of self discovery which included living in Osho meditation communities in Germany and in Uruguay, attending Humaniversity and getting certified as a Human Potential Coach.



Operations Support Manager

Arin has a background in business, leadership development and yogic philosophy, and has spent most of her career as a startup Founder working on projects to scale healing and transformative experiences.

She is a Reiki Master Teacher, and is certified as an integrative psychosomatic coach with special concentration in relationships and sexuality. She believes business is a powerful vehicle for positive change and that change has to start at the heart of business: its people and it's leaders.

Her journey with Psychedelics began in Peru's Sacred Valley, and she is passionate about bringing more integration and balance to the healing journey through embodiment and self-care.

Management Team


Co-Founder & Executive Director

Martijn is the Co-Founder of HighExistence and Apotheosis, has a background in interdisciplinary science and philosophy, and with a strong foundation in coaching and entrepreneurship, he aims to make psychedelic tools accessible in a safe, legal, and modern context.

Martijn has been writing and speaking about psychedelics, interviewing experts in this field, and helped organize The Interdisciplinary Conference on Psychedelics Research 2016 in Amsterdam.

He first reached out to psychedelics when he was in search of new perspectives and clarity to reorient his way of being. Today it is his mission to lower the barrier for deep transformation.



Co-Founder & Director of Business Development

Myles has spent his career on three different continents launching or leading VC-funded startups with technological, socially responsible, and green initiatives.

He has a strong belief that business and capitalism, when incentivized correctly, can be the most powerful tools we have to make positive, sustainable change in our modern society, and is excited to bring his experience to the psychedelic movement.

Specifically with Synthesis, Myles looks forward to developing an impact-focused business model that increases access to safe, legal and professionally-guided psychedelic experiences and sets an example for what a psychedelic-integrated future can look like.



PhDc. | Director of Operations

Rachel is a serial entrepreneur, conscious business and leadership coach, speaker, and conscious social change facilitator with nearly 20 years of experience working with clients across the U.S., Europe and East Africa.

In addition to her passion for conscious business and leadership, Rachel is focused on the transformation of trauma into action and leadership. Her practice includes a variety of modalities integrating body, breath, meditation, and creative arts-based practices.

Rachel holds a B.A. in Transformative Education & Leadership and a M.A. in Clinical Mental Health and Mindful-Trauma Informed Leadership. Rachel is currently working on her PhD in Integral/Transpersonal Psychology.


Join The Synthesis Team