Jeffrey Guss, MD

Jeffrey Guss is a psychiatrist, psychoanalyst, and researcher with specializations in psychoanalytic therapy, addictions and psychedelic therapy. He was Co-Principal Investigator and Director of Psychedelic Therapy Training for the NYU School of Medicine’s study on psilocybin-assisted psychotherapy in the treatment of cancer related existential distress, and is currently is a study therapist on studies of Psilocybin-Assisted treatment of Major Depressive Disorder and MDMA-Assisted Psychotherapy for PTSD. Dr. Guss is interested in the integration of psychedelic therapies with contemporary psychoanalytic theory and has published in Studies in Gender and Sexuality and Psychoanalysis, Culture and Society. He co-authored a paper on the influence of therapists’ first hand experience with psychedelics on psychedelic-assisted psychotherapy research and is an Instructor and Mentor with the California Institute of Integral Studies’ Center for Psychedelic Therapies. He maintains a private practice in New York City.

Jeffrey Guss, MD

Facilitators

Jayne Gumpel, LCSW

Jayne is the founder of Relationship Resources LLC. Jayne is a psychotherapist, trainer, and teacher with 30 years of experience working with couples, individuals, and groups in New York City and Woodstock, NY.

Jayne is a professional clinical trainer in Psychedelic Integration Psychotherapy, is a member of the Woodstock Therapy Center’s Ketamine-Assisted Psychotherapy (KAP) team, and has completed MDMA-assisted psychotherapy training through the Multidisciplinary Association for Psychedelic Studies (MAPS).

Jayne describes meditation as a core life practice, is a teacher of Mindfulness-Based Stress Reduction, and she includes mindfulness practice as a foundation of her work with clients.

She is additionally trained in Imago Relationship Therapy and Gestalt Psychotherapy. Jayne is a co-founder of accessmindfulness.org, a 501c3, along with her son David. Her passion is supporting clients on their journey towards inner wisdom and healing from trauma to have more rich and satisfying lives and relationships.

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David Gumpel, MA

David is a co-founder of Relationship Resources. He is an Integral Master Coach and a qualified teacher of Mindfulness-Based Stress Reduction (MBSR) through UMASS medical school.

David is the co-founder of Access Mindfulness (www.accessmindfulness.org) a 501c3 that brings mindfulness programs to schools and youth services organizations.

Currently Director of Training Operations at Fluence, he provides guidance to Fluence trainers, leads experiential trainings and ensures the successsful implementation of Fluence’s many offerings on psychedelic therapy. David was previously a study coordinator for the MAPS sponsored MDMA-Assisted Therapy for the treatment of post-traumatic stress disorder study in New York City.

As a coach, David teaches mindfulness to clients in private practice and to groups in corporate settings. Find him online at ebcpathways.com and at www.fluencetraining.com

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Matthias Von Reusner, MD

Matthias is a board-certified Family Physician with an active practice in the Hudson Valley. Matthias received training in Ketamine-Assisted Psychotherapy at the prestigious Ketamine Training Institute and is a team member of the KAP team at the Woodstock Therapy Center. Matthias became inspired to do psychedelic psychotherapy work after experiencing indigenous medicine ceremonies in Peru with the Shipibo people. Since then he has deepened his knowledge of shamanic practices with training at The Four Winds Academy. Matthias feels passionately about couples work, particularly using ketamine as a tool for building trust and intimacy.

He has been married 32 years and has raised two children with his wife Susan. They have lived in the Hudson Valley since 1999 after training as a rural physician in the Scottish Highlands. Matthias is a 200h certified yoga teacher and has completed Mindfulness Based Stress Reduction (MBSR) as an active meditator. He has recently became a student in sound healing and enjoys trail running with his two German Shepherds.

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Seema Desai, MD

Seema is a board certified child, adolescent, and adult psychiatrist with a clinical interest in the intersection of spirituality and psychiatry. She integrates principles of mindfulness into her work with patients and teaches on topics of mindfulness and mental health.

For the past 10 years she has served as assistant clinical professor of psychiatry at NYU School of Medicine and at the NYU World Trade Center Health Program treating first responders who suffer from mental health conditions related to events of 9/11.

Seema has experience in leading mindfulness-based skills groups for stress reduction and wellness. She co-edited a book published by the American Psychiatric Association titled "Becoming Mindful: Integrating Mindfulness into your Psychiatric Practice" She has been a study therapist in research examining the effects of psilocybin on depression and existential anxiety related to end-stage cancer diagnosis.

She is currently a study therapist in a MAPS trial examining the effects of MDMA assisted psychotherapy for the treatment of PTSD. Seema offers psychopharmacology treatment and Ketamine-Assisted Psychotherapy in her private practice.

Seema is a member of the Woodstock Therapy Center.

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Dee Dee Goldpaugh, LCSW

Dee Dee is a psychotherapist and clinical supervisor in private practice specializing in sex and relationship therapy, trauma, spirituality, and Psychedelic Integration Psychotherapy. They are also a member of the Woodstock Therapy Center Ketamine-Assisted Psychotherapy (KAP) Team.

Dee Dee has written and presented widely on the topic of psychedelics and sexuality, queer identity, trauma, spiritual practice, and pleasure.

They have presented at the Institute for Contemporary Psychotherapy, The Alt Sex Conference Speaker’s Series, The Center for Optimal Living, and have forthcoming publications on psychedelics and sexuality in the journal Sexual and Relationship Therapy and the Queering Psychedelics book.

Dee Dee is the Community Support and Integration Director of the Hudson Valley Psychedelic Society and has a clinical training background in Sex Therapy, EMDR, Internal Family Systems Therapy, and psychodynamic psychotherapy.

They are an artist and musician, and have additional training in shamanic healing and bioregional herbal medicine. Dee Dee’s approach to psychotherapy embraces body and sex positivity and spiritual growth as tools for self-actualization.

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Saundra Jain, MA, PsyD, LPC

Saundra is an Adjunct Clinical Affiliate, School of Nursing, at The University of Texas at Austin, and a psychotherapist in private practice. Her research explores the connection between wellness-enhancing practices and improvements in disease and wellness markers, as well as its anti-inflammatory effects. Dr. Jain is a co-creator of the WILD 5 Wellness Program and co-author of a well-received workbook written for those interested in improving their mental wellness, WILD 5 - A Proven Path to Wellness. WILD 5 is an evidence-based wellness intervention that combines five elements of wellness (exercise, mindfulness, sleep, social connectedness, nutrition and positive psychology “practices) into an easy-to-follow program.

Dr. Jain is co-creator of the Psychedelics and Wellness Survey (PAWS) exploring the intersection between psychedelics and wellness. She serves as a member of the Psych Congress Steering Committee providing direction regarding educational gaps/needs for mental health practitioners, and Sana Symposium providing psychedelics education for mental health and addiction professionals.

In her words: “Client care, education, and research light me up. Engaging in group work paves the way for meaningful connections with others and fosters a deeper connection with our authentic selves, forming the bedrock of genuine healing. Embracing a life centered around wellness practices and being part of a supportive community is my path.”    

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Mark Green, MD

Mark Green, MD is a psychiatrist specializing in addictions. He completed his residency and addictions fellowship at Cornell before conducting research into stress and addictions at Rockefeller University. He has been on Faculty at Cornell, Vermont and Harvard, and lectured nationally on harm reduction, evidence-based treatment, opiate treatment and psychotherapies. Mark has run outpatient and residential programs and systems in several states. Until recently Mark owned and operated Psych Garden in Belmont, MA, which provided evidence-based, family-focused and harm reduction treatment. Mark is a certified therapist and supervisor in training in AEDP and has trained in ketamine assisted psychotherapy with Phil Wolfson; the MAPS study for MDMA for PTSD; has taught ketamine assisted psychotherapy at Harvard conferences, the Boston Psychedelic Training Center, and at multiple retreats.

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Irina Linetskaya, MD

Irina is a board certified Internal Medicine physician and LGBTQ+ health and HIV specialist whose integrative medicine practice, Contemplative Medicine, focuses at the intersection of physical illness, emotional trauma, and spirituality. Irina has supplemented her rigorous medical education with training in Ketamine-Assisted Psychotherapy with Drs. Phil Wolfson and Bessel van der Kolk, Internal Family Systems Therapy (Level 1), Core Energetics (a somatic psychotherapy modality), and over a decade of Vipassana meditation practice.

Irina grew up in the former Soviet Union in a family deeply burdened with mental illness, violence, and post-Holocaust trauma. Her own healing journey via somatic trauma therapy, Vipassana meditation, and psychedelic-assisted therapy in the US and the Peruvian Amazon opened her eyes to the complex nature of health and illness - complexity reaching far beyond her Western medical education. Irina has come to regard most illness as the body’s attempt to communicate, in an increasingly insistent voice, deep-seated imbalances within. Her clinical approach is one of deep listening and root-level healing of the body, mind, spirit, and ancestry. Irina speaks multiple languages and is passionate about bringing multi-dimensional, tailored healing to individuals, groups, and communities, with a primary focus on populations deeply impacted by systemic violence, poverty, and ancestral trauma.


Irina is an avid hiker, mushroom forager, and adventurer who splits her time between the Hudson Valley and Brooklyn.


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James Lawer

James brings with him extensive training in diverse spiritual traditions, as well as training in theater, dance and music composition.  He brings these experiences to his client-centered work that is devoted to personal and relational wellbeing.  James is highly experienced in sacred work that evokes non-ordinary states of consciousness, especially those that evoke threshold and shape-shifting experiences.

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Tammy Nelson, Ph.D

Tammy Nelson, Ph.D., is a renowned expert in the field of sex and couples therapy. She is a TEDx speaker, the host of the podcast The Trouble with Sex, and the author of six books, including Getting the Sex You Want  and Open Monogamy: A Guide to Co-Creating Your Ideal Relationship Agreement. She is a Board Certified Clinical Sexologist, a Certified Sex and Couples Therapist, AASECT Certified Sex Therapist and Certified Imago Relationship Therapist, andthe founder and Executive Director of the Integrative Sex Therapy Institute. She has been featured in hundreds of press articles including in the NY Times, Washington Post, NY Times Magazine, Wall Street Journal, and Time Magazine, and is a guest on radio, podcasts, and on television in the US and around the world. She can be found atwww.drtammynelson.com

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Lisa Wang, MD

Lisa Wang is a board-certified adult psychiatrist and psychotherapist based in New York City. She takes an integrative approach to treatment that incorporates psychotherapy, psychopharmacology, and other complementary treatment modalities including ketamine-assisted psychotherapy. She facilitates both individual and group ketamine-assisted psychotherapy. Her clinical interests include spirituality, healing from trauma, and sexuality and gender issues.


She is trained as a psilocybin-assisted psychotherapist through Compass Pathways and has been a lead therapist on studies of psilocybin for treatment resistant depression and body dysmorphic disorder at New York State Psychiatric Institute. She is a site physician for the MAPS-sponsored Phase 3 Clinical Trials of MDMA-Assisted Psychotherapy for PTSD. She is also an assistant trainer with Fluence. She is also the NJ medical director for Journey Clinical.


She has been a practicing Tibetan Buddhist for the past 15 years and has experience teaching mindfulness in classroom settings and in her therapy office. She aspires to bring her experience from the cushion as a meditator to all aspects of her work.

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Sylvia Rosenfeld, LCSW

Sylvia Rosenfeld LCSW is an Imago trained, AASECT certified Sex Therapist, with more than 40 years of experience working with couples and individuals who want to enhance their sexual and emotional connection.

Her passion with her clients and in her own life is to cultivate mutually satisfying and deeply loving relationships.

Sylvia is currently participating in the Fluence ketamine assisted psychotherapy certificate program

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Donna Sorgen, LMHC

Donna is a psychotherapist with over 20 years experience working with adults, children, adolescents, couples, and groups. She is the Director of the Woodstock Therapy Center and the Ketamine-Assisted Psychotherapy (KAP) Program at WTC.

She is also the Director of a new Ketamine-Assisted Therapy Certificate program. Donna has spent her career working with diverse clients in multiple settings.

Donna’s current private practice includes KAP, Psychotherapy, and Psychedelic Integration Psychotherapy. In addition to KAP training Donna has completed training in MDMA-Assisted Psychotherapy for PTSD through the Multidisciplinary Association for Psychedelic Studies (MAPS). Donna has a background in the creative arts.

She was a sushi chef, caterer, and enjoys painting and gardening. Donna is inspired in her work as a psychotherapist to help us move toward individual and collective transformation.

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Kerrie-Anne Weickert

Kerrie-Anne offers her expertise in sound healing to participants at our retreats.

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Julia King Olivier, MD

Julia is a Swiss trained psychiatrist and psychotherapist for adults, adolescents and children working for over a decade in a private practice in Geneva, Switzerland. She is a graduate of the CIIS Certificate Program in Psychedelic Therapy and Research (2021 Boston Cohort) and has completed the five-part training in MDMA-assisted psychotherapy with the MAPS organization. She is the Founder of the Compassionate Care Center in Geneva, Switzerland, providing legal compassion focused psychedelic assisted psychotherapy for the treatment of PTSD, depression and existential distress in patients with terminal illness. She turns to poetry as a daily meditative and meaning-making practice. Julia is an avid Wim Hof breathwork practitioner enjoying year round open water swimming in Lac Léman.

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Rohini Kanniganti, MD, MSPH, HMDC

Rohini is a Boulder based Board Certified Family Physician.  She has served in hospice and palliative care for over a decade, currently as Associate Medical Director at Mountain Valley Hospice and Palliative Care in NC.  She completed a fellowship in Integrative Psychiatry through the Integrative Psychiatry Institute, and serves at the Integrative Psychiatry Centers, as well as leading Physician support for the Experiential aspect of the IPI Psychedelic Assisted Therapy Training.   She is a hybrid of science, art and sacred, and is always ready to play

In her words “I am called "the patient whisperer" by colleagues. I am a physician who brings insight, intelligence and love to patient care, and humor and innovative thinking to my teams. I am a leader who is deeply present and curious, searching for underlying patterns and concerns to resolve conflict.”

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Andrew Tatarsky PhD

Dr. Andrew Tatarsky has worked with people who struggle with drugs and their families for over 40 years.

A leader in the field, Dr. Tatarsky developed Integrative Harm Reduction Psychotherapy (IHRP) to address the spectrum of risky and addictive behavior.  As the Director of Clinical Programming at Freedom Institute, Dr. Tatarsky will integrate the IHRP framework into the organization’s abstinence-based programs to develop a comprehensive, individualized, harm reduction-informed addiction treatment program. He is also responsible for the development and facilitation of internal and external IHRP training programs for individual practitioners and organizations.

A renowned clinician, educator, author, and advocate, Dr. Tatarsky aims to reinforce a re-humanized view of problematic substance use and provide a continuum of care that extends help to all those who need and want it.  The principles of IHRP are described in his book, Harm Reduction Psychotherapy: A New Treatment for Drug and Alcohol Problems, which has been translated into three languages. Dr. Tatarsky has also led over 100 training, consulting, and teaching presentations across 20 countries.

Before joining Freedom Institute in 2024, Dr. Tatarsky served as the director of the Center for Optimal Living in New York City, which he founded in 2011. He has also worked as a consultant to a broad range of behavioral health organizations and practices.

Dr. Tatarsky holds a doctorate in clinical psychology from the City University of New York and is a graduate of New York University’s Postdoctoral Program in Psychoanalysis and Psychotherapy. He is a long-time member of the Medical and Clinical Advisory Panels to the New York State Office of Addiction Services and Supports (OASAS) and has contributed to the OASAS regulations that support a harm reduction approach.

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Alessandra Licul

Alessandra specializes in helping clients with deep introspection and insight through psychedelic integration and ketamine-assisted psychotherapy. The idea of human thriving versus human surviving informs her work, and she is interested in facilitating change and healing rather than coping. Her therapeutic technique is rooted in psychodynamic practice but draws heavily from depth psychology, existential psychology, positive psychology, and acceptance and commitment therapy. She completed an MA and Ed.M in mental health counseling at Columbia University, with a concentration in the Spirituality, Mind-Body Institute.

She does not believe in managing symptoms exclusively and believes true healing and growth come from identifying and treating the root causes of distress. Her approach is straightforward and collaborative; she wants to talk with you, not at you. She can be challenging and direct, but at the same time she strives to provide everyone who comes into her office with a place where they feel supported, heard, and cared for. Analysis and insight into existing behaviors and patterns are important, but she does not want the work to stop there. Much therapy stops at the naming and identifying stage, but she works with individuals to facilitate real growth and change based on that learning (much in line with the school of strengths-based psychotherapy).

She believes her greatest strength as a clinician is that she truly cares about each case and wants you to succeed just as much as you do. She believes that we all have thoughts and behaviors we want to change, but to do so in a substantial way, deeper introspection and understanding are required. She also thinks that we cannot change that which we cannot name. She believes a shift in perspective and a new lease on life is possible for anyone willing to do the work with her; she is here to facilitate those insights and help you live in alignment with your true self.

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Daniel J. Zimmerman, M.D.

Dan is a board-certified psychiatrist in private practice in New York City.  

Dan completed his residency at MGH/McLean in Boston, where he received the Hackett Award for academic research.  He subsequently completed a public psychiatry fellowship at Bellevue Hospital.  

As a former English literature major who gravitates toward subjectivist and hermeneutical understandings of the mind, Dan is a “throwback” to the days when psychiatrists were versed in psychotherapeutic theory and methods, in addition to psychopharmacology.  Upon discovering and training in ketamine-assisted psychotherapy since last year, Dan has been most thrilled to work with a medicine that can facilitate and enhance the psychotherapy process.

Dan recently opened a group psychiatry practice in the city called Acheron, where he trains therapists and treats patients using conventional and psychedelic psychiatry methods.  

Dan lives in Park Slope with his spouse Amanda, a neuropsychology professor at Cornell Neurosurgery, and his two young sons, Jonah and Gabriel.  

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