About Us

George C. Chang Chien, D.O. specializes in musculoskeletal medicine and comprehensive pain management. He was trained in Physical Medicine & Rehabilitation at the Rehabilitation Institute of Chicago, the #1 Ranked Rehabilitation Hospital in the United States since 1991. After completion of his Physiatry training, he completed fellowship training in comprehensive pain medicine at the prestigious Cleveland Clinic Anesthesiology Institute.

Dr. Chang Chien has authored over 100 manuscripts on a variety of topics including Regenerative Medicine, orthopedics, and advanced interventional procedural medicine. He has active research in regenerative medicine applications for medical aesthetics, pain management, sports-related injuries, and has been a collaborator on multiple multi-center studies.

Dr. Chang Chien speaks regularly throughout the world on Regenerative Medicine. His professional teaching experience includes being a CIPS Examiner for the World Institute of Pain, ABIPP examiner for Regenerative Medicine and Interventional Pain, ultrasound course Director at the Cleveland Clinic, Regenerative Medicine Course Director for American Society of Interventional Pain Physicians, and the Society for Pain Practice Management.

Dr. Chang Chien specializes in all aspects of Regenerative Medicine and has distinct expertise in platelet rich plasma (PRP), bone marrow aspiration for stem cells (BMAC), and adipose-derived stem cells (ADSC).

He is the Founder of the GCC Institute, Medical Director for Pain Management at Ventura County Medical Center, and the Director for the Center for Regenerative Medicine at Southern California University. He is the Director for Medical Education of Apex Biologix, and serves in the editorial board for Pain Physician medical journal and is the section editor for Regenerative Medicine.

To learn more about Dr. George C. Chang Chien, you can visit his website at http://www.regenmeddoctor.org

Dr. Sudhir Diwan is a top-rated, highly sought after pain management specialist and serves as the executive director of Manhattan Spine & Pain Medicine. Dr. Diwan is well-known for treating the most complex and challenging cases of chronic pain through numerous interventional procedures and is a leading specialist in regenerative medicine.

Dr. Diwan has provided his expertise in pain medicine to articles appearing in leading newspapers including The New York Times and The Los Angeles Times, and has made various television appearances including Fox 5’s Good Day New York and Health Headlines on CBS for the latest research on radiofrequency lesioning for chronic back pain.

In addition to his busy pain management practice, Dr. Diwan lectures extensively and interacts regularly with experts in the field of pain medicine nationally and internationally. He has been a guest speaker for many noteworthy organizations including the American Cancer Society, the American Society of Anesthesiology, the American Society of Regional Anesthesia and Pain Medicine, the World Institute of Pain, and numerous pain specialty societies and congresses in Europe. He is also a regular speaker for the New York State Society of Anesthesiologists on the topic of pain management and management of cancer pain.

Dr. Atluri is rated by Becker Review as the one of the Top 70 Interventional Pain Physician in US and one of the Top 25 Interventional Pain Physician in Ohio.He is on the Task Force for the State Medical Board of Ohio to prevent Prescription Opioid Abuse. He is on expert witness panel for the State Medical Board of Ohio to prosecute physicians causing the epidemic of prescription opioid abuse. Dr. Atluri is triple board certified in Pain Management. He is certified by American Board of Specialities, American Society of Interventional Pain Physicians and World Institute of Pain. He is also board certified in Anesthesia.

He served as the Vice President of the Ohio Chapter of American Society of Interventional Pain Physicians. He was also a Speaker at the Annual and Semi-Annual national meetings of American Society of Interventional Pain Physicians.

Bert Mandelbaum, MD, is an orthopedic surgeon, a member of the Board of Directors and co-chair of medical affairs at the renowned Cedars-Sinai Kerlan-Jobe Institute in Los Angeles. He has over three decades of experience covering a range of orthopaedic, adult, and pediatric sports medicine, and overall wellness topics.

Dr. Mandelbaum currently serves as the Associate Chief Medical Officer for Major League Soccer, Medical Director for the FIFA Medical Center of Excellence in Santa Monica, Co-Director of The USOC CSS National Medical Center of Excellence and resides on the USOC National Medical Network Advisory Group. He has served as director of research for Major League Baseball and team physician for numerous collegiate and Major League Soccer teams, as well as for the U.S. Soccer Men’s National Team. He currently serves as medical director of the FIFA Medical Center of Excellence in Santa Monica, and on the U.S. Olympic Committee National Medical Network Advisory Group. 

Dr. Mandelbaum also served as Chief Medical Officer for the 2015 World Special Olympic Games in Los Angeles; Chief Medical Director for the 2016 Copa America Centenario and CONCACAF; FIFA IOC Medical Officer for the 2016 Summer Olympic Games in Rio de Janeiro, Brazil; and Chief Medical Officer for the 2017 CONCACAF Gold Cup. He is a member of multiple professional medical societies including the American Academy of Orthopaedic Surgery, the American College of Sports Medicine and the American Orthopaedic Society for Sports Medicine. 

In addition to authoring and co-authoring a bevy of clinical research on a variety of orthopaedic topics, Dr. Mandelbaum has received numerous public accolades including designation as a Super Doctor in Sports Medicine and Orthopaedic Surgery for a consecutive 12-year period since 2007. Dr. Mandelbaum is also a frequent medical expert contributor to mainstream media publications and websites including Medscape, Sports Illustrated, NBC Sports, MSN and Men’s Health, as well as local and television news outlets, including NBC, ABC and Fox television affiliates.

Richard Rosenthal, M.D. is a world-renowned Pain Medicine Physician who has incorporated regenerative injection therapies into his everyday pain medicine practice. He is board-certified in Anesthesiology, Pain Medicine, Addiction Medicine and Interventional Pain Medicine. He graduated from the University of Utah medical school in 1985. In 1993 he graduated from an anesthesia residency at the University of Texas at San Antonio Medical Center. He is the Founder, President, and Medical Director of Nexus Pain Specialists.
Dr. Rosenthal has distinguished himself as a leader in educating and training medical professionals in the fields of Interventional Pain and Regenerative Medicine. He is the editor of the interventional pain section of the widely read journal, Practical Pain Management. He developed a one-year pain medicine fellowship which teaches young physicians the skills in Interventional Pain and Regenerative Medicine. Dr. Rosenthal is a master instructor for the prestigious organization the Spinal Intervention Society. He has taught physicians in both the United States and Europe how to correctly perform various spinal procedures. He has authored several scientific articles and book chapters on topics in the specialty of pain medicine. He is also involved in clinical research and has served as an expert witness in malpractice cases. His clinic was awarded the Excellence in Multi-disciplinary Pain Care Award by the World Institute of Pain (one of only 4 clinics in the United States to receive the award in 2011).
Dr. Rosenthal has been practicing Regenerative Medicine for the past several years. He has acted as Course Director for more than 30 Regenerative Medicine courses and has also lectured at several national conferences. He specializes in the use of stem cells and platelet rich plasma for the treatment of painful joints, including the knee, hip and shoulder. His treatments are based on a comprehensive approach to relieving pain and improving function. Dr. Rosenthal has lectured on the topic of Regenerative Medicine, especially Platelet Rich Plasma and Stem Cells treatments, for such prestigious organizations as the American Society of Interventional Pain Physicians and the Society for Pain Practice Management.
http://www.nexuspaincare.com/

Dr. Donaldson’s primary attention is centered on the prevention and treatment of disease and chronic pain disorders through appropriate dietary and lifestyle modifications, nutritional supplementation and various treatment modalities. He practices general family medicine, but has specific interests in chronic pain disorders, sports medicine/orthorpedics, mental/emotional disorders, cancer, healthy aging & natural hormone balancing, diabetes/obesity/wt management, heart disease as well as digestive disorders & detoxification.

Dr. Calodney earned his medical degree from the University of Missouri School of Medicine and completed a family medicine internship at St Joseph’s Hospital in Syracuse, New York. His residency in anesthesiology and subsequent interventional pain management fellowship was completed at the University of Texas Health Science Center at Houston. He subsequently completed a fellowship in pediatric anesthesia at the Denver Children’s Hospital. After spending several years as a faculty member in the Department of Anesthesiology at the UT medical school in Houston, Dr. Calodney moved to East Texas where he has practiced since 1991.

With particular interest in Spine and special interests including Neuromodulation and Intrathecal Drug Delivery, Biological treatment of the painful degenerative disc, Peripheral nerve injury, and Radiofrequency ablation, Dr. Calodney has presented and published many articles and textbook chapters. He is actively involved in clinical research and has delivered over 250 invited lectures in the US and abroad. Dr. Calodney also specializes in treating pain through the use of regenerative medicine and implements these techniques, when applicable, into his practice.

Dr. Calodney is a member of the American Society of Anesthesiologists, American Society of Regional Anesthesia and Pain Medicine, International Spine Intervention Society, International Neuromodulation Society, American Society of Interventional Pain Physicians, North American Neuromodulation Society, Texas Pain Society, Texas Medical Association, Texas Society of Anesthesiology, and the Smith County Medical Society.

Dr. Joel Baumgartner is a board certified physician with a specialized fellowship in non-surgical orthopedics and sports medicine. He earned his medical degree from the University of North Dakota School of Medicine and completed his family practice residency at the University of North Dakota. Dr. Baumgartner completed his advanced training in sports medicine with a fellowship in primary care sports medicine at Hennepin County Medical Center. He utilizes the latest in diagnostic and treatment technology to better treat musculoskeletal injury and pain. As an international speaker, he instructs both physicians and those in the medical industry on pain evaluation, diagnosis and the latest treatment options. Dr. Baumgartner has authored a book on Prolotherapy and PRP technique, He is also a contributing author on the subject of pain management for a variety of other popular publications. His family and faith remain his priority. Dr. Baumgartner’s favorite name to be called is “Daddy”.

Robert Kinne, M.D. is double board certified in Physical Medicine and Rehabilitation and Sports Medicine. He earned his medical degree from Indiana University School of Medicine, after which he completed his residency in PM&R. Following, he completed two fellowships: the first in Interventional Spine and Pain Management and the second in Primary Care Sports Medicine, both with an emphasis on traditional as well as regenerative medicine treatments.

Dr. Kinne has a passion for sports and musculoskeletal medicine, utilizing both fluoroscopy and ultrasound in his daily practice. He has served as a team physician for multiple affiliated minor league hockey and baseball teams as well as NCAA universities. He remains committed to providing both traditional and novel treatment options for his patients and is well versed in many modalities. He has utilized and maintains expertise in various regenerative medicine applications including Platelet Rich Plasma, Bone Marrow Aspirate Concentrate and Adipose-derived MSCs for treatment of a variety of sports, spine, joint and other musculoskeletal injuries and conditions.

Outside of his clinical practice, he remains active in teaching, having provided lectures and hands-on training in ultrasound, fluoroscopic-guided procedures and regenerative medicine throughout the United States for numerous professional organizations including the American Medical Society for Sports Medicine, American Society of Interventional Pain Physicians and the Advanced Regenerative Medicine Institute. He stays involved with these societies as well as the Spine Intervention Society, Interventional Orthopedics Foundation and the American Academy of Physical Medicine and Rehabilitation.

When not working, he loves spending time with his daughters and wife and serves as the pitching coach for a local high school baseball team.