Within Center Team

  • David Naylor

    Founder & CEO

  • Dr. Eric Miller, M.D.

    Medical Director, Within Clinic

  • Katie Murray, PA-C

    Physician Assistant

  • Jeremy Bergeron

    Center Director

  • Patrick

    Patrick Stanger

    Creative Director

  • Ash Sumida

    Retreat & Community Manager

  • Madeleine Gray, RN

    Functional Wellness Coach

  • milada-vigerova

    David Burks, LCSW

    Therapist

  • Crystal Larkins

    Crystal Larkins

    Admissions and Program Director

  • Shannon Grossman

    Center Manager & Scheduling

  • sarah slack

    Sarah Slack

    Psychedelic Guide

  • HeatherMcCan

    Heather McCan

    Psychedelic Guide

  • Sarah Andrews

    Psychedelic Guide

  • Ashley Buchanan

    Ashley Buchanan

    Psychedelic Guide

  • Sarah Castro

    Marketing Director

  • Amber Cress

    Therapist

  • Trecy Bergen, MSN, APRN, PMHNP

David Naylor

Founder & CEO

David is an experienced Chief Executive Officer with an exceptional background in launching companies, along with a lifelong passion and deep personal journey of healing trauma, addiction, mental health and awakening consciousness through many different modalities such as Plant Medicine, Ancient Traditions, Gut Health, Microbiome, nervous system regulation, and mindfulness practices. After a long career with Google, David went on to launch 4 different healthcare companies that resulted in 4 treatment centers, 12 aftercare homes, with over 60 employees. His passion and purpose is healing and expanding consciousness, and transforming the current healthcare paradigm. David lives in Austin, Tx with his partner Mariya, two children, two dogs and enjoys playing pickleball, boating, and spending time with his community & friends where they get to live together in meaningful community & friendship.

Dr. Eric Miller, M.D.

Medical Director, Within Clinic

Dr Miller is a physician who specializes in Internal Medicine and Obesity Medicine, practicing since 2008. He is originally from New York, currently residing in Austin, TX. Dr Miller is particularly passionate about empowering people to take control of their health with diet and lifestyle choices, as well as by implementing other holistic treatments in order to achieve physical and mental well-being. Dr Miller is an IFBB Pro athlete and in his spare time enjoys exercising and spending time with his pup, Evey. 

Katie Murray, PA-C

Physician Assistant

Hi, my name is Katie Murray. I have always been very passionate about understanding the brain, how it relates to the mind and consciousness, and understanding the biochemical mechanisms that contribute to various mental health conditions. My mission in life has always been to understand these underlying mechanisms in order to figure out to help people to heal from and live with the conditions they experience. I have undergraduate degrees in neuroscience and psychology and a masters in Physician Assistant studies. After graduation I spent time working in a clinic in my hometown of Minneapolis, MN facilitating IV ketamine infusions to patients with mental health and chronic pain conditions before convincing my family to move to Austin, TX with me. In Austin I spent over two years working in a full service psychiatric clinic doing medication management and facilitating ketamine treatments before coming to work at Within. I was drawn to Within because of their visionary mission and unique approach of integrating ceremonial practices with psychedelic medicines to promote holistic healing.

Jeremy Bergeron

Center Director

As the Center Director at Within.Center, Jeremy leads the center’s innovative mental health initiatives, leveraging his expertise from roles at Google and as media strategist working with Fortune 500 executives at Mission.org. Passionate about mental wellness, he’s deeply involved in the center’s pioneering work in the psychedelic health field. Outside work, Jeremy’s interests span marketing, leadership, and storytelling, with personal time devoted to snow skiing, enjoying Barton Springs, and fatherhood. His journey reflects a dedication to innovation, health, and family.

Patrick Stanger

Creative Director

Patrick Stanger is a seasoned professional with over two decades of experience in marketing, media, and personal development. Beginning his career in radio broadcasting, Patrick swiftly rose to prominence as an influential voice and creative director, connecting deeply with audiences and shaping compelling narratives. Transitioning seamlessly into advertising, he showcased his entrepreneurial spirit by creating and founding an events-based ad agency that he eventually sold. Alongside his professional endeavors, Patrick is deeply committed to personal growth and holistic wellness, exploring diverse psycho-spiritual practices and embracing creativity and innovation as he continues to navigate new horizons.

Ash Sumida

Retreat & Community Manager

Ash Sumida is a visionary leader in the holistic space, renowned for building conscious businesses, brands, and teams. Passionate about human design, gene keys, and psychedelic integration, Ash integrates these elements into both life and work. Ash holds certifications in somatics, trauma-informed practices, authentic relating, and metaphysical healing arts, skillfully facilitating healing and personal growth. Currently serving as the Retreat and Community Director at the Within Center, Ash fosters transformative experiences and deep connections. When she’s not holding space for our clients and facilitators or building our integration program, she is busy being a wonderful mama to her 6 year old kiddo!

Madeleine Gray, RN

Functional Wellness Coach

Meet Madeleine, a dedicated and dynamic Registered Nurse (RN) with over a decade of clinical experience across diverse healthcare settings. With a strong foundation in oncology, neurology, general surgery, and orthopedics, Madeleine has honed her skills in providing compassionate and comprehensive care to patients facing a range of health challenges.

Driven by a passion for holistic health and a desire to address the root causes of illness, Madeleine embarked on a journey to deepen her understanding of holistic nursing practices. Recognizing a gap in traditional healthcare, Madeleine pursued additional training as a holistic RN, wellness coach, and personal trainer, seeking to explore the interconnectedness of metabolic dysfunction and overall well-being.

Through ongoing study and professional development, Madeleine has evolved into a Functional Health Nurse, blending her clinical expertise with a multifaceted approach to healing. Specializing in cellular health by correcting deficiencies through mineral balancing, antioxidant extracts and personalized wellness plans. Madeleine is committed to empowering patients to take control of their health journey and achieve optimal wellness.

With a holistic perspective and a focus on personalized care, Madeleine strives to make a meaningful difference in the lives of her patients, advocating for a comprehensive approach to healthcare that addresses both the physical and emotional aspects of healing. With a passion for education and empowerment, she is dedicated to supporting individuals on their path to greater health and vitality.

David Burks, LCSW

Therapist

David Burks is a licensed therapist at Within. David has been a committed student of meditation for over 15 years and has taught Mindfulness-Based Stress Reduction (MBSR) in hospital and University settings. He brings an experiential and somatic approach to therapy, having trained in Hakomi Therapy and also studying Internal Family Systems (IFS) and Accelerated Experiential Dynamic Psychotherapy (AEDP). His style is warm, relational, and present centered, and he has experience with people suffering from trauma, depression, anxiety, addiction, and spiritual crisis, with a special focus on spiritual growth.  David is interested in the sacramental use of psychedelics to enhance mental health, spiritual growth, and overall well being.

Crystal Larkins

Admissions and Program Director

Shannon Grossman

Center Manager & Scheduling

Hello! My name is Shannon Grossman, and I am serving as the Center Manager. I love it! I have been working with the sobriety field now for over three years. With a background in the Arts and Small Businesses, I have found a complete passion for helping people and small businesses get to the next level. There is nothing better than to realize, what you possess is a talent of inspiring someone else to believe in themselves, to walk with them until they can see the path of their own freedom.

That is exactly what we are looking to do, to breathe life back into sobriety, and help you get to the next level of you. I am very lucky to have this opportunity, work with a team, and collaborate with so many Mentors that share this same goal. I have once heard that if you truly love what you do, you never have to work a day in your life! I now know what they mean.

Sarah Slack

Psychedelic Guide

Sarah is a born spiritual healer. Born and raised in Texas and spending the better years of her childhood just north of Austin. She has always had a gift of holding a safe space for others, and offering a listening ear that will leave you feeling seen and heard. Born into a family of pastors in a Protestant church, spirituality has always been a part of her life one way or another. Moving away from the dogma of religion, Sarah looks to her relationship with the divine spirit (God) for guidance, and moves through her life with integrity, authenticity, kindness, and love. She uses her gifts to help others find their way, connect deeper with themselves, move through life with more embodiment, enrich what is present, and inspire them to reach their dreams.

Sarah offers a unique approach to ketamine therapy by using the skills she learned through massage therapy and from her own journey of healing through psychedelics. She has been a licensed massage therapist since 2010 and a certified yoga teacher since 2018. She’s been on an avid non-stop healing journey since 2019 by overcoming strong negative habitual patterns, addiction, re-connection to herself and spirit, and difficult life challenges.

She will use her intuition to help direct and anchor you through your ketamine journey. Using drums, sound bowls, essential oils and fans, while also offering energy healing and somatic holds to help you anchor into your reality, dive deeper with yourself in a safe and loving container, and find healing for your mind, body, and spirit. She listens to you deeply, will offer reflective feedback, will softly challenge both your thoughts and perspectives, and most importantly is a strong support for you during this time of healing and radical change.

Heather McCan

Psychedelic Guide

Hi, my name is Heather McCan. I am a somatically trauma-informed guide at Within Center.I have 14yrs experience working with plant medicines, participating in sacred ceremonies as a guardian and working in healing spaces. I have also been a licensed massage therapist since 2011. In 2016 I was liberated from a life-threatening addiction to alcohol in a sacred plant medicine ceremony. It was the beginning of a profound journey on a path of healing, recovery, and transformation. By the grace of God I found my way to the medicines, people, and healthy practices that helped save my life. I am here as a beacon of light and hope; True healing and transformation is possible. My heart’s greatest desire is to utilize all the knowledge I have attained and all that I have overcome to help others find their own inner healer.

I am a student of the divine and have the heart of a theologian. I love reading sacred spiritual texts and exploring the unseen realms. I enjoy snowboarding, hiking, music, dancing, concerts and going to transformative festivals. I have a little doggie named Vega… she is the light of my life!

Sarah Andrews

Psychedelic Guide

Ashley Buchanan

Psychedelic Guide

Ashley Buchanan is a yogini, intuitive healer, guide, priestess, mentor and clairvoyant empath. She believes that all souls came to this Earth with their own mission, medicine and magic. She is here to support the release of blockages that are affecting your reality, open channels, and restore your energy to a state of equilibrium. Ashley is passionate about serving others along their journey of self-discovery, shining light on your own divinity to help you remember who you are and what your soul came here to do. To unleash your power, unlock and activate your gifts, and amplify your fullest, most authentic expression. To help bring you into alignment with your soul destiny. Through experiential wisdom, channeled guidance, light language activations and quantum field work, Ashley facilitates healing, harmony and ascension for your soul’s highest and greatest good.

Sarah Castro

Marketing Director

Amber Cress

Therapist

Amber Cress is a therapist who uses an eclectic approach to healing, integrating somatic techniques, Cognitive Behavioral Therapy (CBT), and Internal Family Systems (IFS). With a wealth of experience in crisis intervention, she has provided invaluable support on both traditional crisis hotlines and pioneering psychedelic hotlines, demonstrating her versatility and adaptability in the field of mental health. Amber’s passion for exploring alternative healing modalities led her to study the indigenous use of psychedelics with several tribal communities, deepening her understanding of holistic wellness and cultural sensitivity. In her practice, she utilizes somatic techniques to help clients reconnect with their bodies, CBT to challenge negative thought patterns, and IFS to explore the complexities of their inner world.

Trecy Bergen, MSN, APRN, PMHNP

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