Erin Crow, CMT

###Certified Massage Therapist

Erin brings over 25 years of massage therapy experience, offering compassionate and skilled care to a wide range of clients. Her practice is rooted in medical massage modalities, including Swedish massage, Esalen deep bodywork, myofascial release, prenatal massage, and elder care.

With a focus on both therapeutic outcomes and whole-person wellness, Erin integrates deep tissue techniques, relaxation methods, and Reiki energy work to address acute and chronic physical conditions, overuse injuries, and post-injury rehabilitation. From athletes recovering from strain to elders managing age-related challenges, she provides individualized care that promotes healing, mobility, and overall well-being.

Erin’s approach combines clinical knowledge, intuitive touch, and a deep sense of empathy, allowing her to meet each client where they are and provide meaningful, results-driven care.

Erin Crow, CMT ###Certified Massage Therapist Erin brings over 25 years of massage therapy exper... Read More

Dr. Eric Dickerson, DC, FRCms

###Founder | Sports Chiropractor | Director of Clinical Development

As the Founder and Director of Clinical Development at Radius Physical + Sports Rehab, Dr. Eric Dickerson is a dedicated musculoskeletal provider who blends clinical expertise with a patient-centered approach. He integrates functional rehabilitation, evidence-based physical rehabilitation modalities, joint manipulation, and advanced manual therapy techniques to craft a comprehensive approach to your health.

Dr. Dickerson emphasizes individualized care rooted in modern movement science. Whether treating acute injuries, chronic pain, or performance limitations, he and the Radius team prioritize function, blending multiple treatment modalities to restore full-body function and optimize physical performance.

Before founding Radius, Dr. Dickerson led a team of providers in Seattle, WA, treating a wide spectrum of conditions—from calf strains and frozen shoulder to low back pain and post-surgical rehabilitation. His commitment to quality care earned him recognition as a Top Doctor by Seattle Met Magazine. In 2017, he relocated to the Sierra Nevada foothills to launch a clinic rooted in clinical integrity, compassion, and forward-thinking rehabilitation.

Dr. Dickerson holds a Bachelor of Science in Kinesiology from Arizona State University and earned Magna Cum Laude honors from Palmer College of Chiropractic in Iowa, where he received the Academic Excellence Award. He served as Vice President of the Palmer Package Club, trained peers in orthopedic and neurological exam protocols, and was an active member of the Sports Council, supporting athlete recovery at competitive events. His global perspective was shaped by humanitarian work providing chiropractic care in Salvador, Brazil.

Originally from the Chicago area, Dr. Dickerson brings the same energy he gives to his patients into his personal life. An advocate for active living, he enjoys golf, basketball, hiking, and softball—though these days, much of his time is spent adventuring with his daughter Kennedy and newborn son Benjamin.

Dr. Eric Dickerson, DC, FRCms ###Founder | Sports Chiropractor | Director of Clinical Development... Read More

Ronja Geisser, CMT

###Certified Massage Therapist

Ronja Geisser brings over 12 years of experience in therapeutic massage to the Radius team. She completed her training at the esteemed Hawaiian Islands School of Massage in 2009 and has since developed a deep passion for helping people reduce pain, manage stress, and restore balance through skilled, compassionate bodywork.

Ronja specializes in the treatment and prevention of musculoskeletal dysfunction and pain, integrating techniques such as myofascial release, trigger point therapy, neuromuscular work, Swedish massage, Lomi Lomi, sports massage, and deep tissue therapy. Her approach is both intuitive and evidence-informed, tailored to support each individual’s physical and emotional well-being.

Outside the treatment room, Ronja finds joy in movement and nature—whether she’s dancing gracefully on aerial silks or exploring the outdoors.

Ronja Geisser, CMT ###Certified Massage Therapist Ronja Geisser brings over 12 years of experien... Read More

Dr. Tristan Ginkel, DC, FRCms

###Sports Chiropractor | Functional Range Conditioning Mobility Specialist | Golf Game Optimizer Originally from Gilroy, CA, Dr. Tristan Ginkel, D.C., FRCms, recently relocated to Grass Valley to continue his passion for helping patients move and feel their best. A 2022 Palmer College of Chiropractic graduate, he brings fresh expertise and a deep commitment to enhancing patient well-being.

Over the past two years, Dr. Tristan has gained extensive experience in sports performance chiropractic and neuropathy clinics, delivering personalized care to help individuals achieve their health and performance goals. He holds certifications in Functional Range Conditioning, Myofascial Decompression, and Active Release Technique, allowing him to use advanced, evidence-based methods to effectively treat a wide range of conditions.

Outside the clinic, Dr. Tristan enjoys mountain biking, skiing, golfing, and spending quality time with his wife and their two dogs.

Dr. Tristan Ginkel, DC, FRCms ###Sports Chiropractor | Functional Range Conditioning Mobility Spe... Read More

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Zsophia Lightstep, CMT

###Certified Massage Therapist As a graduate of the National Holistic Institute, I specialize in injury rehabilitation and therapeutic bodywork. My approach is results-driven, with a strong focus on helping clients recover from pain and physical limitations. I believe in empowering people through body awareness and intentional healing—so every session is not only about relief, but also about restoring balance and confidence in the body’s ability to heal. Whether you’re recovering from an injury, managing chronic discomfort, or simply looking to improve mobility, my goal is to support your journey with skilled, focused care tailored to your needs.

Zsophia Lightstep, CMT ###Certified Massage Therapist As a graduate of the National Holistic Inst... Read More

Grafton Prewett, PT, DPT, CCM Certified

###Physical Therapist | Concussion & Balance Specialist | Movement Optimizer

With over seven years of clinical experience, Grafton Prewett is a results-driven and compassionate physical therapist based in Grass Valley, California. He specializes in orthopaedic rehabilitation, vestibular and balance disorders, concussion management, and fall risk reduction in the geriatric population. Grafton is certified in Complete Concussion Management™ and is known for combining clinical expertise with a whole-person, evidence-based approach to care.

Grafton earned his Bachelor of Science in Exercise Physiology from California State University, Chico, where two years of personal training experience ignited his passion for movement science and rehabilitation. He then went on to earn his Doctorate of Physical Therapy from Chapman University, where he further developed his clinical skills in manual therapy and progressive therapeutic exercise.

Early in his career, Grafton managed the physical therapy department within a busy primary care practice. This experience gave him a unique lens into the broader medical world and deepened his understanding of general medicine, diagnostic processes, and interdisciplinary care. It also sharpened his ability to identify how physical therapy fits within the larger healthcare picture—ensuring that each patient receives coordinated, comprehensive care.

Grafton’s approach to rehab is active and collaborative. He firmly believes that patient engagement is key to recovery, and his treatment plans reflect that—balancing hands-on techniques with functional, goal-driven exercise tailored to the individual. He excels at seeing the “big picture” of a patient’s health and works closely with other healthcare providers when needed to ensure every piece of the puzzle is addressed.

Fluent in Spanish and conversational in Portuguese, Grafton’s language skills were shaped through international clinical experiences. He interned at an orthotics and prosthetics clinic in Brazil, helping to fabricate assistive devices for patients; spent two months working with patients in Costa Rica; and volunteered with underserved communities in Haiti. These experiences broadened his cultural awareness and deepened his ability to provide personalized, empathetic care.

Outside of the clinic, Grafton lives an active lifestyle—skiing, trail running, hiking, golfing, climbing, hunting, and fishing. Having personally recovered from various orthopaedic injuries, he brings empathy, resilience, and real-world experience to his practice, helping patients of all ages return to the activities they love.

Whether you’re recovering from an injury, managing a chronic condition, or seeking to improve your strength, balance, or mobility, Grafton Prewett delivers expert care with purpose, precision, and heart.

Grafton Prewett, PT, DPT, CCM Certified ###Physical Therapist | Concussion & Balance Speciali... Read More

Dr. Austin Van Poole, DC

###Active Rehab Chiropractor | Movement Optimizer

Dr. Austin Van Poole, D.C. is a dedicated musculoskeletal rehabilitation chiropractor from Yuba City, California, with a strong focus on soft tissue therapy and rehabilitation exercises to enhance performance, restore function, and alleviate pain. Passionate about helping individuals recover and thrive, he combines his extensive education, athletic background, and hands-on expertise to provide personalized, results-driven care. Dr. Van Poole earned his undergraduate degree in Sports, Exercise, and Wellness and a master’s degree in Education: Administration and Policy from Dakota Wesleyan University. As a collegiate football player and graduate assistant strength and conditioning coach, he developed a deep understanding of biomechanics, injury prevention, and rehabilitation. Driven by a desire to expand his knowledge and skills, he pursued his Doctor of Chiropractic degree at Parker University in Dallas, TX, where he was actively involved in student organizations and gained advanced clinical experience as part of the university’s sports pod.

After graduation, Dr. Van Poole started his career with Airrosti Rehab Centers, specializing in soft tissue therapy and rehabilitation exercises. Effectively treating a wide range of musculoskeletal conditions, from headaches, acute strains and sprains, to chronic pain, with a focus on helping patients restore function and optimize performance. His experience at Airrosti allowed him to refine his expertise in musculoskeletal rehabilitation, helping patients return to their active lifestyles pain-free.

Now back in his hometown of Yuba City, Dr. Van Poole is committed to delivering high-quality, patient-centered care. When he’s not helping patients achieve pain relief and peak performance, he enjoys spending time with his wife and daughters, playing golf, and perfecting his BBQ skills.

Whether recovering from an injury, managing chronic pain, or striving for peak performance, Dr. Van Poole brings a wealth of knowledge and a holistic approach to rehabilitation. Book an appointment today to take the next step toward better movement, function, and overall well-being.

Dr. Austin Van Poole, DC ###Active Rehab Chiropractor | Movement Optimizer Dr. Austin Van Poole,... Read More

Dr. Chris Whalen, DC, FRCms

###Rehab Manager | Sports Chiropractor | Rehabilitation Specialist

Dr. Chris Whalen is a chiropractor and rehabilitation specialist dedicated to helping people recover from injury, improve movement, and build long-term resilience. As the Rehab Manager at Radius, he brings a deep understanding of functional rehabilitation, strength training, and movement optimization to every patient interaction.

He earned his Doctor of Chiropractic degree from Palmer College of Chiropractic West, where he served as a teaching assistant for rehabilitation and physical therapy courses and was an active member of the Rehab 2 Performance Club. Prior to becoming a chiropractor, Dr. Whalen worked as a personal trainer, focusing on injury prevention and athletic development. He also holds a Bachelor of Science in Kinesiology from Sonoma State University and gained valuable clinical experience as a physical therapy intern.

Dr. Whalen has worked with a diverse population—from youth athletes honing their skills, to older adults striving to maintain mobility and independence. His clients have included international men’s lacrosse champions, professional soccer players, Ironman triathletes, ultra-marathon runners, and everyday movers of all ages—from 8-year-old athletes to 75-year-olds staying strong and active. No matter the stage of life or performance level, he is passionate about helping people move better, train smarter, and gain confidence in their physical capabilities.

His treatment philosophy goes beyond pain relief. He focuses on identifying movement dysfunctions, improving biomechanics, and building durability through individualized rehabilitation plans. By blending strength training, corrective exercise, and hands-on manual therapy, Dr. Whalen helps patients not only resolve injuries but also optimize performance and prevent future setbacks.

He has also supported athletes at high-level events, including the first ACA Sports Council gathering post-pandemic. Grounded in the belief that fitness is the foundation of a pain-free, capable, and active life, Dr. Whalen is committed to helping people exceed expectations and regain trust in their bodies.

Now based in Nevada City, he is proud to serve the local community with expert rehabilitation and performance care tailored to each individual’s unique needs.

Dr. Chris Whalen, DC, FRCms ###Rehab Manager | Sports Chiropractor | Rehabilitation Specialist D... Read More