Dr. Shawn P Tierney - DC, RMSK
Dr. Shawn P. Tierney is an expert musculoskeletal sonologist specializing in ultrasound-guided procedures such as stem cells, PRP, spinal injections, and nerve hydrodissection. He has done extensive work in Sports Medicine, Rehabilitation, and Nutrition, in addition to his Chiropractic Medicine practice these past 15-plus years.
As a leader of multiple regenerative medicine clinics in Southern California, Dr. Tierney is sought-after for his expertise and has actively assisted in the recovery of many professional athletes, including members of the U.S. Water Polo Team, the U.S. Olympic Swim Team, and players in the MLB and NFL. He is also an experienced educator, serving on the faculty of MSKUS, instructing both physicians and sonographers in musculoskeletal ultrasound.
Meet Our Team
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Dr. Matt Cook is a globally recognized expert in regenerative orthopedics and functional medicine, with over 20 years of experience. As the founder of BioReset Medical, BioReset University, and BioReset International, he has developed innovative, multimodal approaches to healing complex conditions at the cellular level.
Barbara Branaman is the business mind behind BioReset Medical, turning Dr. Matt Cook’s vision into reality. Barbara, a leader in Eastern and Western medicine, drives growth in medical practices and product divisions, drawing from experiences as a multiple organ transplant survivor.
Dr. Adam Lustig is a dual board-certified physician in family and sports medicine with expertise in regenerative therapies, movement optimization, and longevity. Trained at Columbia and the University of Miami, he refined his approach under Dr. Matt Cook, integrating advanced treatments to restore function and support lasting health.
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Dr. Harry McIlroy is a board-certified Family Medicine physician with a master’s in Oriental Medicine and 25+ years in integrative care. He focuses on non-invasive therapies, specializing in functional medicine, ketamine treatments, and medical cannabis.
Dr. Bronwyn Holmes is a board-certified physician with advanced training in functional and regenerative medicine. She brings a deeply personalized approach to care - combining her expertise in hormone optimization, longevity science, and pediatric regenerative therapies to support patients across every stage of life. Her clinical work focuses on two key populations: women navigating hormonal transitions and children with complex health needs.
Dr. Jeffrey Wiegers is a board-certified anesthesiologist and interventional pain specialist with a deep commitment to advancing regenerative medicine. His clinical approach integrates cutting-edge techniques with a holistic understanding of patient care, aiming to restore function and alleviate chronic pain through minimally invasive therapies.
Heather Lanier is a registered nurse and aesthetic specialist with over a decade of experience in regenerative medicine. She provides treatments like micro needling with PRP, BBL facials, and NAD IV drips to support skin health and rejuvenation.
Learn more about BioReset Medical
Patient Testimonials
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"For years, I struggled with pain. After working with BioReset, I feel like myself again—strong, mobile, and energized."
M.T.
Pro Athlete
"Their approach to medicine is unlike anything I’ve experienced. It’s completely changed how I think about health."
S.K.
Entrepreneur
I’ve worked with many doctors in my career, but this team is truly next-level.
J.S
Elite Performer
"Their approach to medicine is unlike anything I’ve experienced. It’s completely changed how I think about health."
S.K.
Entrepreneur
"For years, I struggled with pain. After working with BioReset, I feel like myself again—strong, mobile, and energized."
M.T.
Pro Athlete
"For years, I struggled with pain. After working with BioReset, I feel like myself again—strong, mobile, and energized."
M.T.
Pro Athlete
"Their approach to medicine is unlike anything I’ve experienced. It’s completely changed how I think about health."
S.K.
Entrepreneur
I’ve worked with many doctors in my career, but this team is truly next-level.
J.S
Elite Performer
"Their approach to medicine is unlike anything I’ve experienced. It’s completely changed how I think about health."
S.K.
Entrepreneur
"For years, I struggled with pain. After working with BioReset, I feel like myself again—strong, mobile, and energized."
M.T.
Pro Athlete