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Integrative Psychology with Our Licensed Clinical Psychologist

Hills Neuroscience uses an integrative treatment model and Eastern approaches to health and wellness to help your brain, body, and mind function optimally. Licensed clinical psychologist Dr. Kellie Delli Colli and her team take a psychophysiological approach to treatment to help people with co-occurring disorders process their challenges and learn new tools to move forward in life to reach the pinnacle of wellness.

The Hills Difference

Reach the Pinnacle of Mental, Physical, and Emotional Health

To reach the peak of mental health, we believe we must integrate three paths: Brain, Body, and Mind. In our experience, the treatment of all three gives you the best chance at achieving optimal performance and well-being. We blend therapies from the fields of psychology, neuroscience, technology, and complementary and alternative medicine to deliver customized treatment based on your specific needs. Tap into your brain, body, and mind, and reach the pinnacle of mental, physical, and emotional health.


Dr. Kellie Delli Colli

President and Licensed Clinical Psychologist (PSY26338), PhD, BCN, HRV, RYT

Dr. Kellie Delli Colli is a licensed clinical psychologist who graduated with her PhD from the California School of Professional Psychology.  She is board certified by Biofeedback Certification International Alliance (BCIA) in neurofeedback and heart rate variability biofeedback, specializing in clinical psychophysiology at Hills Neuroscience. She is trained in Eye Movement Desensitization and Reprocessing Therapy (EMDR) for the treatment of trauma and PTSD.

Dr. Nicole Karst

Licensed Clinical Forensic Psychologist (PSY32340), PsyD, LVN (VN224444)

Dr. Nicole Karst is a licensed Forensic psychologist who graduated with her PsyD from the California School of Professional Psychology. She has worked in the health and mental health field since 2004. Her experience started as a Fleet Marine Force Corpsman in the United States Navy. Following her honorable discharge, she became licensed as a vocational nurse in the state of California. Her military and nursing experience was central to her decision to enter the field of psychology and make her impact at Hills Neuroscience. The slouching posture from the weight of depression and the tense muscles of someone with PTSD inspired her to learn more about the connection between the mind and body. She specializes in treating people with trauma, anxiety disorders, mood disorders, substance use disorders, obsessive-compulsive disorder, and disordered eating. Her dissertation explored the public perception of yoga compared to psychotherapy for inmates in the United States and yoga was perceived as superior in value.  Her literature review revealed emerging research and support for integrating the body into trauma treatment using modalities like yoga, conscious breathing, and meditation. She enjoys hiking the Sequoias, overnight camping, singing, and spending time with friends and family.  At Hills, she is inspired to continue helping people heal their mind-body and reconnect with life.

Dr. Christian Pedretti, DACM

Licensed Acupuncturist, (L.Ac. 19130)

While studying during his undergraduate at the University of Wisconsin-Whitewater, Dr. Pedretti had his own health crisis that steered him toward acupuncture and lifestyle medicine. As an acupuncturist who dealt with a chronic illness for 20 plus years, Dr. Pedretti knows what it’s like to live with a lingering condition. Through his decade of experience in wellness and formal education at Pacific College of Health and Science, it was clear to him that all patients need a tailored treatment to step closer towards optimal health. Through a unique style of acupuncture, herbs and addressing underlying food intolerances his approach is simple and manageable for his patients. In his schooling, he focused on psychoneuroimmunology and functional medicine in conjunction with his primary focus on acupuncture. Above all, Dr. Pedretti is a lifelong learner who welcomes questions and curiosity in the treatment room. He believes to better one’s health, it requires bringing awareness to our daily actions through the lens of curiosity. He finds that when one adopts that mindset, the patient is well on their way to healing. At Hills, he looks forward in incorporating his skillset and personal experiences to support each patient’s unique healing journey.

Dr. Greg Buttner

Counselor, PhD, AMFT (AMFT126119), APCC (APCC9689)

Dr. Greg Buttner holds a Ph.D. in Pastoral Counseling and Tibetan Buddhist Psychology, a Master’s Degree in Clinical Psychology from Pepperdine Graduate School of Education and Psychology. He is a Spiritual Counselor through the American Institute of Health Care Professionals and holds certifications in Addiction Science and the Neurobiology of Alcoholism and is board-certified through the American Association of Alternative Medicine. He spent years studying both secular and non-secular studies in the United States and India. He strives to provide the client with a unique opportunity to use both ancient and contemporary methods to delve into what makes this life so meaningful. Having had the opportunity to study under some of the most profound spiritual teachers in India and Nepal, he is delighted to have the opportunity to share these ancient teachings at Hills. He brings his transformational experiences to Hills from his own journey.

Natasha Muskavitch

Administrative Assistant, BA

Natasha is currently attending Alliant International University in pursuit of her Ph.D. in Clinical Health Psychology.  She has experience working with children, adolescents, and adults with irritable bowel syndrome, rumination syndrome, gastrointestinal disorders, gastroesophageal reflux disease, hypertension, anxiety, depression, ADHD, and other mental health conditions. More specifically, she specializes in biofeedback, cognitive behavioral therapy, and mindfulness-based interventions while integrating treatments that utilize psychology, technology, and eastern approaches.  Her research interests include using stimulation therapies with biofeedback for major depression. She loves spending time with her two dogs, going to the beach, listening to music, and spending time with family and friends. She enjoys integrating technology in her work at Hills.

Dr. Kathryn Miller

Chiropractor, DC (DC21443)

Dr. Kathryn Miller received a Bachelor of Science degree in biological science from the University of California, Irvine, and a Doctor of Chiropractic degree from Los Angeles College of Chiropractic. She has been practicing chiropractic care in San Diego since 1993. She uses a variety of techniques to adjust the spine to remove interference from the nervous system, which allows the body to heal itself. In her spare time, she enjoys running, hiking, and spending time with her three children and two dogs. She finds her role at Hills Neuroscience essential in addressing the mind-body connection.

Jana Sullivan

Massage Therapist, BS, CMT (85735)

Jana is a certified massage therapist. She graduated from Healing Hands School of Holistic Health in San Diego, California. She earned her Bachelor of Science degree from Salem State College in Salem, Massachusetts majoring in sport fitness with a minor in biology. Her love for nature led her to graduate from outward bound leadership and survival school in Ely, Minnesota. Jana is a veteran of the United States Army who served under the 368th Engineer Battalion out of Manchester, New Hampshire. Her experiences working in the US military fueled her desire to utilize massage therapy for people inflicted with trauma, substance use disorders, chronic pain, chronic stress, and emotional problems. She specializes in deep tissue massage (myofascial release) for people who sit for long hours, use computers and other forms of technology, and for those who store emotional pain and stress in their bodies. Her love for her community and people continue through her work at Hills.

Sonya Grey

Massage Therapist, Cranial Sacral Therapist, and Holistic Health Practitioner, BA, CMT (28243), HHP

Sonya completed her bachelor’s degree in Human Development and Family Studies from Auburn University. She is certified in therapeutic massage and neuromuscular therapy. In 2011, Sonya completed a 2-year Biodynamic Craniosacral Therapy Program where she learned about the body’s extraordinary innate capacity to heal from physical, emotional, and psychological trauma. She later integrated Craniosacral Therapy which allowed her to study the physiological and somatic-emotional intricacies of the craniosacral system and how it relates to our whole being. Her passion is utilizing massage therapy to alleviate depression, anxiety, stress, pain, and the improvement of immune function. She has been working in treatment centers for substance use disorders for the past 9 years. Sonya’s niche is supporting those who are open to healing, want to know themselves better, and release patterns that no longer serve them. She is thrilled to be a part of the healing team at Hills.

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