Board of Directors

2015 The Spine Intervention Society (SIS) Board of Directors

Executive Committee/Officers


John MacVicar, MB, ChB


Dr. MacVicar was born and raised in the Scottish Highlands and educated at the University of Glasgow Medical School. He has lived and worked in Christchurch, New Zealand, since 1980. He is vocationally registered with the Medical Council of New Zealand in musculoskeletal medicine and is the medical director of a multidisciplinary rehabilitation clinic. His main clinical interest is the evidence-based use of interventional techniques for the investigation and treatment of spinal pain, and he was trained in the application of these techniques through the Department of Clinical Research at the University of Newcastle, Australia. He has been a member of the Spine Intervention Society member since 2004 and is currently President.


Timothy Maus, MD

Vice President

Dr. Maus graduated from Mayo Medical School in 1981, completed a Diagnostic Radiology residency at the Mayo Graduate School of Medicine in 1985, and subsequently joined the Mayo Clinic Department of Radiology. After several years working primarily in Vascular and Interventional Radiology, Dr. Maus completed a Neuroradiology Fellowship in 1994, received his Certificate of Additional Qualification in Neuroradiology in 1996 and remains a Senior Member of the American Society of Neuroradiology.

Fostering an interest in image-guided pain interventions, Dr. Maus founded a section within Radiology to provide image-guided pain management procedures in 1999, working closely with PM&R, Neurology and Surgical colleagues in the Mayo multidisciplinary Spine Center. He has authored numerous book chapters and peer-reviewed articles on spine imaging and interventions. Dr. Maus serves on the SIS Board of Directors as the Vice President and is a member of the Education Division. He has been a Mayo Fellows Association Teacher of the Year in Radiology, the recipient of the Mayo Individual Award for Excellence in 2003 and 2009, and received the Carmen Award for Excellence in Clinical Practice in the Mayo Department of Radiology in 2012.


D.J. Kennedy, MD


Dr. Kennedy is a Clinical Associate Professor and the PM&R Residency Program Director at Stanford University where his practice focuses on non-operative and interventional spine. He completed his residency in Physical Medicine and Rehabilitation at the University of Washington in Seattle where he served as Chief Resident, and then a Spine and Sports Fellowship at the Rehabilitation Institute of Chicago. He currently serves as the Treasurer of SIS, and has previously on the research division and as the chair of Standards Division. He has also chaired the Annual Program Planning committee for SIS for several years. He has published over 50 peer reviewed journal articles and numerous book chapters. He is on the editorial board for Pain Medicine and is a Senior Editor for the PM&R journal. He is on the board of Trustees for the Association of Academic Physiatrists (AAP) as chair of the Membership Committee, and a Member at Large on the Board of Directors for the American Academy of Physical Medicine and Rehabilitation (AAPM&R).


Matthew Smuck, MD


Dr. Smuck is the Chief of PM&R and Associate Professor of Orthopaedic Surgery at Stanford University. He is the Medical Director of Rehabilitation Services for Stanford Hospitals and Clinics where he specializes in the comprehensive conservative management of spine disorders. He is a Deputy Editor of The Spine Journal, Co-Editor of the Orthopedics Knowledge Update in Spine, 4th edition and is on the Assistant Editorial Board of the European Spine Journal. His research interests lie in objective measures of activity and outcomes assessment in musculoskeletal diseases, and in maximizing the effectiveness and safety of percutaneous spine interventions. Dr. Smuck regularly lectures on his research in the U.S. and abroad. His work has received research awards from numerous scientific medical societies, and he won The Spine Journal's 2013 Outstanding Paper Award for Medical and Interventional Science.


Jeffrey Summers, MD

Past President

Dr. Summers is the Director of Interventional Pain Management Division, NewSouth NeuroSpine, in Flowood, MS. He graduated summa cum laude from the University of Mississippi ("Ole Miss"), in Oxford. He attended medical school at University of Mississippi Medical Center, in Jackson. He completed his Internship and Residency in Anesthesiology at Brooke Army Medical Center, San Antonio, TX. Dr. Summers completed a Fellowship in Pain Management at the University of Texas Health Science Center, San Antonio, and in 1992, underwent further training in advanced pain management interventions at the Pain Relief Institute and Walton Centre for Neurosurgical Sciences, in Walton, England.

Dr. Summers is board certified by the American Board of Anesthesiology, with Added Qualifications in Pain Management. Becker's Orthopedic and Spine Review recently selected him as one of 70 of the Best Pain Management Physicians in America. Dr. Summers is currently the Past President and a Master Instructor for the Spine Intervention Society.


Nikolai Bogduk, MD, PhD

Founding Member

In 2014 Professor Bogduk retired as Professor of Pain Medicine at the University of Newcastle and Director of Clinical Research at the Newcastle Bone and Joint Institute. He spent 43 years teaching Anatomy and Pain Medicine, and undertaking research into the anatomical basis, validity, and effectiveness of techniques for the diagnosis and treatment of spinal pain and headache. He remains active in the Standards Division of SIS, and serves as the SIS Section Editor for Pain Medicine. Otherwise, he is now maintaining a private Conservation Park five hours west of Sydney, Australia.


Margaret Klys, MJ, CAE


Margaret Klys has a bachelor’s degree in Health Information Management from the University of Illinois at Chicago and a Master of Jurisprudence (MJ) in Health Law degree from Loyola University Chicago School of Law.

Ms. Klys is a Certified Association Executive (CAE) and has extensive experience in executive association management. She joined The Spine Intervention Society as the Director of Health Policy in 2010 and was named CEO in 2015. Her previous association experience includes the American Society of Neuroradiology (ASNR) and the American Osteopathic Association. She has spent 20 years working in the healthcare industry and over 15 years working for and advocating on behalf of the physician community.

Board Members


Josh Rittenberg, MD

Education Division Chair

Dr. Rittenberg is Chief of the Physical Medicine and Rehabilitation Department at Kaiser Permanente in Oakland, CA. He is a SIS Society Senior Faculty member and has instructed and lectured at numerous of the society's Bio-Skills Workshops. He is the Chair of the Spine Intervention Society's Education Division and has served on the Annual Scientific Meeting Planning Committee. Dr. Rittenberg attended medical school at New York Medical College and completed his internship at St. Vincent’s Hospital in Manhattan. He received his residency training in Physical Medicine and Rehabilitation at the University of Washington in Seattle. He completed a fellowship in Interventional Spine at the Florida Spine Institute. He spent 10 years on faculty at the Rehabilitation Institute of Chicago, where he was an Associate Professor in the Department of Physical Medicine and Rehabilitation at Northwestern University Feinberg School of Medicine. He has published original research, review articles, and book chapters in the areas of interventional and rehabilitative spine care.


Zack McCormick, MD

Fundraising Committee Chair (non-voting)

Dr. McCormick is an Assistant Professor of Orthopaedic Surgery, board certified Physiatrist, and Interventional Pain Specialist at the University of California, San Francisco. He graduated from Haverford College, Magna Cum Laude and Phi Beta Kappa, and he attended medical school at the University of Pennsylvania School of Medicine. He completed internship and residency training at Northwestern University/ The Rehabilitation Institute of Chicago, as well as a fellowship in Pain Medicine at Northwestern University.

Dr. McCormick is a member of the SIS Education Division, Evidence Analysis Committee, and Patient Safety Committee. He has published over 50 peer-reviewed journal articles and lectures nationally on his research, which focuses on the safety and efficacy of spine and pain interventions. He has received research awards from various Pain Medicine and PM&R medical societies, the Howard Hughes Medical Institute, and the National Institute of Diabetes Digestive & Kidney Diseases (NIH).


Scott Horn, DO

Health Policy Division Chair

Dr. Horn is an interventional spine and musculoskeletal physiatrist at a private practice in Virginia Beach, Virginia. He earned his Doctorate in Osteopathic Medicine from Des Moines University School of Osteopathic Medicine and completed his residency in Physical Medicine and Rehabilitation at the University of North Carolina Hospital in Chapel Hill. After completing his fellowship training in Interventional Spine Medicine in Winston-Salem, NC, he began his service on the Spine Intervention Society's Socioeconomic Committee (now Health Policy Division) and Coding Subcommittee as well as the NASS Coding Committee. He volunteers as faculty for spinal injection and coding courses and holds an appointment as The Spine Intervention Society's Advisor to the American Medical Association's CPT Editorial Panel.                                    


Shihab Ahmed, MD, MPH

Research Division Chair

Dr. Ahmed is a board certified Anesthesiologist and Interventional Pain Specialist. After completing his anesthesiology (Brigham and Women’s Hospital, Boston) and pain medicine training (Massachusetts General Hospital) he began his academic career at the MGH Center for Pain Medicine (MGHCPM). At the MGHCPM he teaches pain fellows, residents and medical students the pathophysiology of pain, specific pain syndromes including cancer pain, and advanced interventional pain therapies such as implantation of indwelling devices. He gives didactic lectures on pain topics to fellows during their training and collaborates with them in his research, case reports and abstracts for presentation at national pain meetings. He is the Multidisciplinary Pain Service Course Director and is responsible for overseeing the medical students’ clerkships at the MGHCPM from the Harvard Medical School. In his clinical practice in the MGH Pain Center he provides care for an average of 50 patients a week. Because of his expertise in interventional pain management techniques, he offers effective and innovative therapy for his challenging patient population. He is an investigator at the MGH Center for Translational Pain Research (CTPR). His current research focuses on the mechanisms of spinal cord stimulation therapy and how pain transitions from acute to chronic pain. He is currently a member of the research committee for North American Spine Society and is the Chair of the Research Division for the Spine Intervention Society.


Yakov Vorobeychik, MD, PhD

Standards Division Chair

Dr. Vorobeychik is Professor of Anesthesiology and Neurology and the Director of Interventional Pain Management at Hershey Medical Center (HMC) and Penn State College of Medicine. He attended medical school in Russia and was working as a Neurologist in Moscow for ten years. During that time his special interest was the treatment of neuropathic pain. Upon coming to the United States, Dr. Vorobeychik completed his Neurology residency at Hahnemann University in Philadelphia and subsequently worked there as a faculty member of its Neurology department. Later on, he enrolled into the Pain Fellowship training program at Massachusetts General Hospital’s Anesthesia Department. Having graduated from this program he accepted a position at HMC Anesthesia Department, where he was appointed the Director of Interventional Pain Management.

Dr. Vorobeychik is certified by the American Board of Psychiatry and Neurology with sub specialization in Pain Medicine. He is an author of original research articles and book chapters. He is actively involved in teaching fellows, residents, and medical students at HMC. Dr. Vorobeychik serves as the Chair of the Spine Intervention Society's Standards Division.


Charles Aprill, MD

Founding Member

Dr. Aprill graduated from LSU Medical School in June 1967, completed his internship at Charity Hospital of Louisiana in 1968, and a radiology residency at Ochsner Medical Foundation in 1971. He was certified in “Radiology” in 1972. After serving in the United States Naval Active Reserves, Dr. Aprill went into private practice of radiation oncology with nuclear medicine and oncologic interventional diagnostic and therapeutic special procedures with Dr. Vincent Collins in Houston.

Dr. Aprill practiced general radiology with emphasis on interventional special procedures for the next decade. In 1986 he opened a solo practice limited to diagnosis and conservative treatment of adult spine disorders. In May 1993 Dr. Aprill established Magnolia Clinic, a solo private interventional pain practice where he remained until Hurricane Katrina closed the doors in September 2005. His current practice, Interventional Spine Specialists, opened in Kenner, Louisiana in January 2006 and continues to this day.

Dr. Aprill is a founding member of the Spine Intervention Society and was recognized in 2003 with an SIS award for outstanding service and dedication as a teacher. He achieved the position of Clinical Professor of Radiology and Physical Medicine / Rehabilitation at Louisiana State University Health Science Center. Dr. Aprill has dedicated time to proctoring physicians in spine interventional procedures through fellowship programs at the University and with SIS education as an instructor since 1990. Clinical work in the private practice has generated about a dozen papers in peer-reviewed journals. Dr. Aprill has authored or co-authored about two-dozen more papers and about a dozen chapters on spine related issues.


Richard Derby, MD

Founding Member

Dr. Derby is the Medical Director of Spinal Diagnostics and Treatment Center and CEO of Comprehensive Spine Diagnostics Medical Group in Daly City, CA. He is a Board-Certified Anesthesiologist. Dr. Derby received his undergraduate degree from Stanford University and his Medical Degree from the University of California at Irvine. He completed his residency at the University of California San Francisco.

Dr. Derby is currently on the Executive Board as Past President and Founding Member of the Spine Intervention Society. He is an active member of several professional societies including the American Society of Anesthesiologists, North American Spine Society, International Intradiscal Therapy Society and the World Institute of Pain. He holds journal, editorial, and review committee memberships for several professional publications including Pain Medicine, The Spine Journal, Spine, The Clinical Journal of Pain, Pain Practice, and Pain Digest. Awards received include: Lifetime Achievement Award (2011), Best Doctor in America (2007-2008), Friend of ASIPP Award (2007), and Sofamor-Danek Posterior Award (1998).

Further, Dr. Derby has given more than 250 invited lectures, presentations, and workshops and is a prolific author with over 130 publications including 20 invited book chapters.

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