WHO WE ARE

Nierika GmbH is a Swiss start-up company that seeks to improve people's quality of life by achieving a balance between mind, body, and spirit through unique, transformative, and unforgettable experiences around the world, as well as 1:1 support sessions with our team of coaches and therapists.

To improve people's lives by promoting their overall health through services, courses, workshops, retreats, and unique experiences around the world, with a personalized approach to each person's goals.

Mission

Vision

To transform lives and create healthy communities through unique and unforgettable experiences.

Values

Excellence and Quality

Always offering the highest level of service and care

Integrity and Transparency

Acting with honesty and ethics in every interaction

Holistic Care

Understand and care for the whole person (body, mind, spirit)

Innovation

Constantly seeking new and better ways to promote well-being, creating a link between traditional and modern medicine

Empathy and Connection

Treat each person with respect to create a welcoming and trusting environment

Sustainability

Commit to responsible practices that benefit the community and the planet

Empowerment

Encourage autonomy and self-awareness so that people can manage their own health

WHERE WE ARE

Our team is located around the world: in Switzerland, Germany, the United Kingdom, Mexico, Thailand, Italy, the Netherlands, and Portugal. We bring together professionals from Western and traditional medicine, shamans, scientists, holistic practitioners, counselors, and therapists.

MICHAEL

FOUNDER & CEO

Michael Romankiewicz was born in Germany in 1987. As a young man, his passion was sports, from soccer to boxing. Michael enjoyed growing up in a community that still maintained ties and communicated with empathy and kindness. At the age of 16, he began his training in mechanical engineering and has experienced the transformation of the industry from different positions.

In his professional career, he has worked in mechanical engineering and plant construction, in the automotive industry, in aeronautical construction, and in other sectors. In addition, he was a manager in three different countries, serving as team leader, department head, and production manager in Germany, Mexico, and Switzerland. He also holds a master's degree in business administration.

In the wake of the pandemic, Michael's experience has led to a radical change in the sectors, with workers increasingly being viewed as nothing more than disposable and replaceable “human resources.” This change in mindset has an impact on the lives of workers and their families, with impossible goals and deadlines, a lack of free time, and work applications on personal mobile devices that prevent workers from disconnecting, as they are expected to be “available” as part of their commitment and loyalty to the companies. It is precisely these conditions that lead employees to suffer from burnout.

He himself has experienced burnout symptoms on two occasions and, thanks to the support of doctors, friends, and family, managed to avoid serious consequences and after-effects of what is now known as the silent syndrome that kills thousands every year. After this experience and because Michael has a vocation for service, Nierika GmbH was born, which is more than just a company; it was created to be a tool for building healthy communities.

Michael was born near Lake Constance, he is the founder and CEO (Cosmic Engagment Officer) of Nierika GmbH, His hobbies include various sports, immersing himself in nature, breathwork, mindfulness and gardening. He currently lives in Switzerland with his wife Adelina and their new avocado tree, Awatkin Groundstander.

JASON

HEAD OF SACRED

MILNE

AND HOLISTIC HEALING

Jason brings more than 25 years of experience in the health and wellness field, supporting individuals in healing, transformation, and expanded self-awareness through an integrative mind–body approach. An addiction recovery counselor, coach, and educator with a Master of Education degree, he has spent the past 25 years guiding people to improve their health, realize their full potential, and live more aligned, empowered lives.

Jason’s path began in his youth, when early psychedelic experiences profoundly opened him to healing, spirituality, and a deeper understanding of his life’s purpose. These formative journeys ignited his passion for working with psychedelics as tools for deep transformation across body, energy, emotion, mind, and spirit. His lifelong dedication as a psychonaut continues to infuse his work with empathy, insight, and lived wisdom.

A devoted yogi and master teacher of yoga, meditation, and breathwork, Jason integrates these disciplines as foundational pillars of the retreat experience. These practices are central to his own daily life—he truly lives what he teaches—and they play a crucial role in supporting participants before, during, and after their psychedelic journeys. Through intentional preparation practices and a strong focus on post-journey integration, Jason helps participants embody their insights and anchor meaningful change into their daily lives.

Since 2007, Jason has been facilitating group work and leading retreats, creating environments where deep inner work unfolds safely and authentically. At psychedelic treatment retreats, he combines meditation, breathwork, yoga, Qigong, mindset coaching, and integration support—drawing from more than three decades of personal practice and professional training.

Jason brings a peaceful, grounded presence to every retreat, shaped by his own long-term inner work and commitment to growth. A compassionate, highly sensitive healer and mentor, he holds space with steadiness, clarity, and warmth, helping participants navigate their experiences with confidence and insight. His retreat philosophy centers on lasting transformation—supporting participants in changing from the inside out and stepping into a more authentic, vibrant, and empowered way of living.

Born in New York City in 1972, Jason majored in Spanish literature and Language at the University of San Diego, before going on to get his Master of Education degree. His passion for teaching led him out of the classroom and into various learning environments around the world. Jason has completed 6 yoga teacher training courses, as a student, in various styles, including yoga therapy, and he has been the lead teacher of 25 yoga teacher training courses. In addition, Jason is a certified breath work facilitator of several styles, Qigong instructor, and Energy healer. He currently thrives in Thailand and loves sharing ancient wisdom and practices with anyone who is interested to learn. His favorite pastime is going deep!

GEHENNA

HEAD OF EVIDENCE-

GUERRERO

BASED WELLNESS

Gehenna is a molecular and cell biologist whose work bridges rigorous biomedical science with a deep commitment to human well-being. With a PhD in Cell and Molecular Biology and postdoctoral training at leading research institutions in Paris, including Institut Curie and Institut Necker Enfants Malades, she has dedicated her career to understanding the intricate mechanisms that sustain health at the cellular level.

Her scientific research has explored stem cell biology, cellular regeneration, and disease mechanisms using advanced models such as organoids, genome editing technologies, and metabolic analysis. Through this work, she developed not only technical expertise but also a profound appreciation for the complexity and intelligence of the human body.

At Nierika GmbH, Dr. Guerrero-Serrano ensures that the company’s programs and experiences are supported by scientific integrity, clarity, and evidence-based understanding. She leads scientific writing, research evaluation, and fact-checking processes, helping to build a meaningful bridge between traditional wisdom and modern biomedical science.

Her approach reflects Nierika’s commitment to holistic care, innovation, and empowerment. She believes that true transformation occurs when scientific knowledge and human experience meet with integrity and responsibility. By integrating precision, ethics, and curiosity, she supports Nierika’s mission to create transformative experiences that foster lasting balance and overall well-being.

KENNY

HEAD OF  TRANSFORMATION

BROWN

Kenny Brown uses a range of recovery models alongside a multifaceted understanding of addiction and mental health, enabling him to tailor his approach to meet the unique needs of each individual he works with.

His extensive time in the charity sector has allowed him to build a wide and trusted network of resources, including CEOs, managers, entrepreneurs, and government agencies across health and social care and beyond. Kenny now works within the private sector alongside a team of first-class clinicians and has recently worked within luxury rehabilitation settings in Switzerland.

Kenny is currently training as an NLP Practitioner, further enhancing his ability to support behavioural change, emotional regulation, and long-term recovery outcomes.

He is known for his warm, attentive nature and his natural ability to help people feel comfortable and at ease. Kenny firmly believes that families and loved ones caught in the chaos of addiction are too often overlooked; as such, he places great importance on involving and updating family members or close friends as an integral part of the recovery process.

With over 20 years dedicated to the field of addiction recovery, Kenny draws upon his own lived experience of substance misuse and mental health challenges, which he overcame early in life. He also has lived experience with psychedelics and maintains an open-minded, informed, and ethical perspective on their emerging role in mental health and wellbeing when approached safely and responsibly. Kenny is an advocate of all evidence-based and holistic approaches that support good health and overall wellbeing.

As a survivor of childhood abuse, Kenny brings a deep understanding of trauma and genuine empathy to his work, allowing him to build trust and strong therapeutic relationships with those he supports.

He prides himself on his honesty and integrity—qualities he once lost during his own battle with addiction, but which now form the foundation of his professional practice. Kenny is committed to the highest standards of discretion and confidentiality, ensuring that every client feels safe, respected, and secure throughout their recovery journey.