About
Matrix Regeneration
Matrix Regeneration was founded on the belief that true healing starts within. Dr. Rob Cadwallader and Dr. InJun Chong combine their shared passion for natural, regenerative, non-invasive therapies to create a space where patients can experience whole-body restoration - without surgery or long recoveries. With backgrounds in chiropractic care and advanced therapies, they unite to offer a whole-person approach to pain relief, joint health, and performance. At Matrix Regeneration, the mission is simple: activate the body's natural ability to heal and help people get back to living fully.
Dr. InJun Chong
Driven by a passion for natural healing, Dr. InJun Chong transitioned from conventional medicine's approach to care - to regenerative therapies after witnessing the limits of traditional treatments for chronic pain and injury. His pursuit of more effective, less invasive solutions led him to advanced techniques to help the body heal naturally.
Dr. InJun graduated from Palmer College of Chiropractic in 2002. He has over 23 years of patient care. He has a 2025 certification from the American Academy of Integrative Cell Therapy (AAICT) Certified in Fundamentals of Stem Cell Practice & Advanced Cell Therapy Protocols.
At Matrix Regeneration, Dr. InJun combines science-backed innovation with patient-centered care - helping people heal from the inside out and return to a life that they love.
Dr. Rob Cadwallader
With a deep-rooted belief in the body's power to heal, Dr. Rob Cadwallader has dedicated his career to helping patients recover naturally and live pain-free. His background in chiropractic care and movement-based therapies laid the foundation for his transition into regenerative medicine.
He received his Doctor of Chiropractic degree from Life University in 1996 and has spent over 28 years helping patients heal through natural healthcare.
At Matrix Regeneration, Dr. Rob focuses on combining advanced treatments with functional care to restore mobility, reduce pain, and support long-term healing from the inside out.
Sharesea Lettre, MSN, FNP-C, APNP
Sharesea is a Certified Family Nurse Practitioner with specialized training in advanced injection techniques. She earned her graduate degree from Concordia University in Wisconsin and has dedicated her career to delivering compassionate, patient-centered care.
In addition to her clinical practice, Sharesea has served as adjunct faculty and instructor for several universities, where she has trained other providers in advanced procedures. This academic and teaching background highlights her commitment not only to her patients, but also to advancing the field of medicine and improving patient care through education and mentorship.
With an extensive experience in advanced procedures and regenerative treatments, Sharesea is dedicated to helping patients restore function, reduce pain, and achieve long-term wellness. She believes patient education is a vital part of the healing process, empowering individuals to make informed decisions about their care. Her precise technique and individualized treatment plans ensure the highest standards of safety, precision, and outcomes for every patient.
Gillian Lettre, MSN, PMHNP-BC, APNP
Gillian is a board-certified Psychiatric Mental Health Nurse Practitioner and owner of Mermaid Med Spa, WI. With over a decade of clinical experience, she blends her psychiatric background with advanced training in regenerative medicine to provide a comprehensive, patient-centered approach to wellness.
Gillian specializes in treatments that restore and optimize health at the cellular level. She integrates evidence-based medical practices with regenerative therapies designed to promote healing, longevity, and natural vitality. She is passionate about creating a trusted, supportive envireonment where science and innovation meet whole-person care.