Dr. Zereshki is a graduate of Rosalind Franklin University of Medicine and Science – The Chicago Medical School and completed his residency in Physical Medicine and Rehabilitation at the University of Michigan. He completed a fellowship in Pain Medicine at Stanford University. He is board certified in Physical Medicine and Rehabilitation and performs electrodiagnostic studies. He joined Pain and Rehabilitative Consultants Medical Group in September 2013.
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Babak Jamasbi
Dr. Jamasbi received his Medical Doctorate from the University of Maryland in Baltimore following an undergraduate degree at the University of California in San Diego and a Master’s Degree at Stanford University, both in chemical engineering. After completing a general surgery internship at University of Maryland, he completed his Anesthesiology Residency at the University of California, Irvine. His strong desire to treat chronic illness in a multidisciplinary setting led him to complete a fellowship in Pain Management at Stanford University Medical Center. He has held a position as Assistant Clinical Professor of Pain Medicine at Stanford Medical Center and is the co-founder of Pain and Rehabilitative Consultants Medical Group, Northern California Functional Restoration Program and Bay Surgery Center. Dr. Jamasbi has served as Medical Director of Pain Management at Alta Bates Comprehensive Cancer Center and was one of the founders of the Spasticity Management Program at Alta Bates Medical Center. Additionally, he served as physician champion at Sutter to set up treatment protocols for management of chronic back pain. He has been on the board of the directors of the California Society of Industrial Medicine and Surgery for many years and has served as the President of the Society. He is Board Certified with the American Board of Anesthesiology with added qualification in Pain Management and is a member of the International Association for the Study of Pain and The American Board of Pain Medicine.
Brendan Morley
Dr. Morley is a graduate of the University of California at Los Angeles School of Medicine and received postgraduate training as a Fellow in Pain Management at UCSF where he later served as a Clinical Professor of Anesthesiology. He began private practice in the East Bay in 1995 helping to establish comprehensive pain management services at the Alta Bates Comprehensive Cancer Center and was awarded a Certificate of Recognition from the California Senate for his work with hospice patients. Dr. Morley subsequently co- founded Pain and Rehabilitative Consultants Medical Group, the Northern California Functional Restoration Program and Bay Surgery Center. Dr. Morley has been a speaker for the California Applicants Attorney Association, California Division of Workers’ Compensation, California Society of Industrial Medicine and Surgery and numerous claims administration groups and has served as an officer and board member of the California Society of Industrial Medicine and Surgery. He is a member of the International Association for the Study of Pain, American Pain Society, and the American Academy of Pain Management, and is board certified with the American Board of Anesthesiology and the American Board of Pain Medicine.
Filip Cheng
Dr. Cheng specializes in Physical Medicine and Rehabilitation (PM&R) and is trained in the non-surgical treatment of musculoskeletal disorders and restoration of function. He is also experienced in performing electrodiagnostic studies (EMG/NCS) to help diagnose nerve issues, such as carpal tunnel syndrome and radiculopathy (sciatica). Dr. Cheng joined Pain and Rehabilitative Consultants Medical Group in 2020, where he is an associate physician and pain medicine fellow. Prior to joining PRCMG, Dr. Cheng completed residency training in PM&R at Michigan State University, where he served as co-chief resident.
Khodadad Namiranian
Khodadad Namiranian, MD, PhD, QME Board Certified in Pain Medicine, Anesthesiology, and Addiction Medicine Dr. Namiranian, a graduate of the University of Maryland School of Medicine with a residency in anesthesiology from Baylor College of Medicine, was fellowship trained in Pain Medicine at the Cleveland Clinic. He is triple board certified in pain medicine, anesthesiology, and addiction medicine and holds a certification in headache medicine. He has worked in various settings, including Kaiser Permanente Fresno and the Veterans Affairs Medical Center in Baltimore, and has published more than 30 peer-reviewed journal articles and book chapters. His practice focuses on comprehensive, individualized pain management through minimally invasive surgeries, injections, medications, and physical rehabilitation, and Dr. Namiranian is dedicated to helping patients regain function and return to their favorite activities.
Natalia Balytsky
Dr. Balytsky is a Board Certified Anesthesiologist and Pain Management Specialist with over 15 years of experience. First studying medicine in Ukraine, Dr. Balytsky transitioned to the United States to the University of Pittsburgh and University of California San Francisco where she was a clinical fellow at the Pain Management Center. In addition to her experience, she is also a member of the American Academy of Pain Management.
Nazir Noor
Dr. Noor completed his interventional pain management fellowship in Los Angeles at Keck Medical Center of the University of Southern California. Prior to this, he earned his Doctor of Medicine degree from Herbert Wertheim College of Medicine in Miami, Florida. He then served as chief resident in anesthesiology at Mount Sinai Medical Center in Miami Beach, Florida. It was during his time in residency that he developed an interest in treating chronic illness and pain through a multimodal approach, leading him to pursue subspecialty training in interventional pain management at USC in Los Angeles, California. Aside from his clinical work, he has given presentations at many medical conferences, such as the American Society of Interventional Pain Physicians, North American Neuromodulation Society, and American Society of Regional Anesthesia and Pain Medicine. He continues to publish his work in many medical journals and textbooks concerning the science and art of pain management and anesthesiology. Dr. Noor is fluent in Farsi/Dari. He joined Pain and Rehabilitative Consultants Medical Group in July of 2023.
Neil Kamdar
Dr. Kamdar is a graduate of Rush Medical College at Rush University Medical Center in Chicago. He remained at Rush University Medical Center for completion of his Anesthesiology Residency and Pain Medicine Fellowship. He is board certified in Anesthesiology and Pain Medicine and trained in interventional pain procedures. He is a member of the International Association for the Study of Pain, American Society of Regional Anesthesia and Pain Medicine, the North American Neuromodulation Society and American Society of Anesthesiologists. He joined Pain and Rehabilitative Consultants Medical Group in 2016.
Richard Musselman
Essentially raised in a hospital by his single-parent Anesthesiologist father, Dr. Musselman began working in medicine at the age of 13 in a rural hospital in the Missouri Ozarks. He attended medical school at ATSU College of Osteopathic Medicine and initially practiced Emergency Medicine and General Practice, adding certifications and fellowships in Family Practice, General Surgery and Geriatrics and has served on these certification boards as well. He is a member of the American Association of Physician Specialists in addition to the American Academy of Family Physicians. With over 50 years practicing medicine, Dr. Musselman brings with him to PRCMG a breadth of experience and a history of championing for his patients from rural to urban clinics and hospitals from Kansas to California (with many stops in between) and is fully fluent in Spanish. Now semi-retired, Dr. Musselman resides part time in Mexico where he and his wife run a scuba dive resort, commuting to California to continue to offer care to injured workers in the Redding and Sacramento areas.
Rory Mullen
Dr. Mullen is a board-certified physiatrist with a strong foundation in musculoskeletal and spine care. He joins Pain and Rehabilitative Consultants Medical Group after serving as Chief of Physical Medicine and Rehabilitation at William Beaumont Army Medical Center. A graduate of Midwestern University’s Chicago College of Osteopathic Medicine, Dr. Mullen completed his residency in Physical Medicine and Rehabilitation at Walter Reed National Military Medical Center, where he was recognized as a top academic performer. His training and clinical experience emphasize a comprehensive, patient-centered approach to musculoskeletal rehabilitation and interventional spine care.
Dr. Mullen is skilled in a wide array of procedures including diagnostic musculoskeletal ultrasound, ultrasound-guided joint injections and nerve blocks, fluoroscopic-guided lumbar interventions, electrodiagnostics, and regenerative medicine. He also brings extensive experience in opioid tapering strategies and functional restoration for complex pain conditions. In addition to his clinical practice, Dr. Mullen has served with distinction as a U.S. Army physician, most recently as a Battalion Surgeon deployed to Eastern Europe. His dedication to service and patient care has been recognized through multiple awards, including the Joint Service Commendation Medal and selection as Preceptor of the Year.
Outside of his clinical work, he finds meaning in movement, nature, and family—often exploring national parks with his wife, and dog and cooking meals in their backyard.

