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STEPAN KASIMIAN, M.D.

Stepan Kasimian, M.D., is an orthopaedic surgeon with specialty training in complex spinal reconstruction and minimally invasive spine surgery. His primary interests include degenerative spine disease and spinal deformity. He has extensive experience in treating multiple spine disorders including disc herniations, spinal stenosis, spondylolisthesis, kyphosis, scoliosis, tumors, and spinal trauma in the cervical, thoracic, and lumbar spine.

EDUCATION

Dr. Kasimian received his undergraduate degrees in Microbiology & Molecular Genetics and History from the University of California, Los Angeles. He completed his internship and residency in orthopaedic surgery at the Los Angeles County-USC Medical Center. After residency, Dr. Kasimian obtained further training in complex spinal reconstruction surgery at Cedars-Spinal Medical Center, Institute for Spinal Disorders.

RESEARCH

Dr. Kasimian has presented his research at the International Meeting on Advanced Spine Techniques and has written a chapter on endoscopic thoracic disc herniations in a prominent spine textbook.

PROFESSIONAL MEMBERSHIPS/AFFILIATIONS

He is a member of the American Medical Association, Alpha Omega Alpha Honor Society, North American Spine Society, and the American Academy of Orthopedic Surgeons. In order to better serve his patients, his practice is located in Beverly Hills, Glendale, and Rancho Cucamonga and he maintains privileges in numerous hospitals including Cedars-Sinai Medical Center and Glendale Adventist Medical Center.

ABOUT DR. THOMAS KREMEN

Thomas J. Kremen, MD is a board-certified orthopedic surgeon with additional subspecialty certification in Sports Medicine and Shoulder Surgery. He has served as team physician all over the country, and around the world, helping athletes across the globe stay at the top of their game. He has served as team physician for numerous organizations including Duke University Intercollegiate Athletics, US Men's National Team Soccer, LA Galaxy (MLS), USA Basketball, and the USA Olympic Swimming Team. He currently serves as a team physician for the UCLA Bruins NCAA Division I intercollegiate athletics teams, the chair of USA Swimming's Sports Medicine and Science Committee, the head team physician for the South Bay Lakers (NBA G-League), and an associate team physician for the Los Angeles Lakers (NBA).

Dr. Kremen has devoted his career to helping patients of all sports levels maintain active lifestyles. Using the latest orthopedic techniques and science, Dr. Kremen helps athletes in Los Angeles recover quickly from injury, getting them back into the game stronger than ever. With his eyes on the future of sports medicine, Dr. Kremen is a federally-funded clinician-scientist who is actively involved in translational research aimed at improving the treatment of soft tissue musculoskeletal injuries (tendons, ligaments, cartilage, etc.).

From shoulder problems to debilitating knee injuries, Dr. Kremen understands the added stresses that active lifestyles place on the human musculoskeletal system. His goal is to not only help his patients overcome their injuries, but also provide essential preventive care to avoid re-injury down the road.

Dr. Kremen earned his bachelor’s degree from the University of California, Santa Barbara in 1998 where he was also captain of the NCAA Division I men’s swimming team. He earned his medical degree from the David Geffen School of Medicine at the University of California Los Angeles (UCLA) in 2006 and then continued at UCLA where he completed his Orthopedic Surgery Residency Training in 2012. 

Between 2008 and 2009, Dr. Kremen honed his research knowledge as a California Institute for Regenerative Medicine Clinical Fellow and in 2013, he completed an Orthopedic Sports Medicine and Shoulder Surgery fellowship at Duke University in Durham, North Carolina. Following his fellowship at Duke, Dr. Kremen accepted a position at Cedars-Sinai Medical Center and their newly formed orthopaedic program where he worked for 5 years prior to returning to UCLA in 2018.

Dr. Kremen stays up to date in his field through memberships in the American Academy of Orthopaedic Surgeons, the Orthopaedic Research Society, the Arthroscopy Association of North America, and the American Orthopaedic Society for Sports Medicine, to name just a few.

In his pursuit of finding the best treatments, Dr. Kremen regularly participates in research studies, and he has published and presented dozens of research papers at both national and international meetings. His research interests include biomechanical studies of shoulder and knee reconstruction procedures as well as innovative biologic therapies to enhance tissue healing and regeneration after musculoskeletal injuries.

Dr. Kremen is currently a full-time faculty member at the University of California, Los Angeles where he provides his patients with state-of-the-art care.

Jonathan H. Koenig, MD, is a Board Certified, fellowship-trained orthopaedic surgeon at Los Angeles Pediatric Orthopaedics serving the Brentwood community on the Westside of Los Angeles. Though Dr. Koenig specializes in treating children and young adults, he’s happy to help any patient who still feels young at heart. 

Growing up on Long Island in the suburbs of New York City, Dr. Koenig was a tri-sport athlete who went on to play varsity lacrosse at Yale University in New Haven, Connecticut. He graduated from Yale with a degree in the history of science and medicine. He then returned to New York City to earn his medical degree at the Albert Einstein College of Medicine in the Bronx.  

Dr. Koenig completed a five-year orthopaedic surgery residency at Lenox Hill Hospital in Manhattan's Upper East Side — home of America’s first official sports medicine department. His training included rotations at world-leading institutions like Boston Children’s Hospital, R Adams Crowley Shock Trauma Center in Baltimore, Maryland, and Memorial Sloan Kettering Cancer Center in New York City. Dr. Koenig served as chief resident during his final year and completed a traveling fellowship at The Royal Children’s Hospital in Melbourne, Australia. 

Leaving New York City for sunny Southern California, Dr. Koenig finished a one-year fellowship in pediatric orthopedics and scoliosis surgery at the world-renowned Rady Children’s Hospital-San Diego. He’s honored to bring his wealth of knowledge and extensive experience to the Westside of Los Angeles, where he resides with his wife, Dani - a native Angeleno.  They enjoy spending time with their young daughter, Harlow as well as their first born - Woody, a golden retriever.

As a former athlete and orthopaedic patient himself, Dr. Koenig has a personal understanding of all aspects of the care he provides. From sports-related injuries like ACL tears or patella dislocations as well as broken bones or limb deformities and joint pains, he makes sure that every patient receives prompt, highly individualized treatment. He’s also happy to provide emergency care for traumatic injuries as they arise.

About Dr. Unal

Berkay Unal, MD, is a fellowship-trained, board-certified orthopedic surgeon specializing in minimally invasive, arthroscopic surgery with an emphasis on shoulder and knee disorders, sports injuries, and arthritis. He treats patients at Samimi Orthopedic Group at its Los Angeles area offices in Brentwood, West Covina, and Sherman Oaks, California. 

Dr. Unal completed his undergraduate studies at The University of California, Berkeley, earning his bachelor’s degree in molecular and cell biology. Following his undergraduate studies, he held a research position at The University of California, Irvine, where he was involved in multiple

publications in molecular biology and infectious disease. 

Dr. Unal realized his true passion was medicine and direct patient care. He attended medical school at The University of Southern California (USC) in Los Angeles, receiving his medical degree in 2011. He completed his orthopedic surgery residency at The University of Southern California (USC) in Los Angeles. Dr. Unal did an additional year of subspecialty training in sports medicine and arthroscopy at The University of Kentucky's Orthopaedic Sports Medicine Fellowship in Lexington. 

Dr. Unal started his practice in Bakersfield, California, treating high-complexity injuries. He brings his experience and expertise to the Samimi Orthopaedic Group team. 

Dr. Unal believes in a non-surgical approach as the initial step in treating most orthopedic conditions. He believes in a personalized approach and takes pride in providing knowledge and guidance to ensure his patients feel comfortable and informed.

He is a member of the American Orthopedic Society for Sports Medicine, the American Academy of Orthopaedic Surgeons, and the American Medical Association.

Dr. Unal enjoys spending time with his wife and his two daughters, weight lifting, hiking, exploring nature, snowboarding, and a variety of recreational sports in his free time. He likes to maintain an active lifestyle and aims to help his patients do the same.

Eric S. Millstein, MD, Los Angeles Orthopedic Surgeon, a Beverly Hills board certified orthopedic surgeon, is a leading expert in advanced arthroscopic techniques for knee and shoulder surgery. He has vast experience treating sports injuries including arthroscopic surgery and reconstruction of the knee and shoulder, as well as joint replacement surgery for arthritis of the shoulder and knee.

Dr. Millstein regularly uses his surgical skills to repair or reconstruct injured bones, joints, ligaments and tendons. However, he believes in effective communication with his patients to allow for a full discussion of all treatment options before proceeding with surgery. In all cases, his ultimate goals are minimizing pain, maximizing function and restoring lifestyle.

Dr. Millstein was born and raised in the suburbs of Chicago, Illinois. He completed his undergraduate pre-medical curriculum and graduated with honors in mathematics at the University of Pennsylvania in Philadelphia (Magna Cum Laude). While living a very active lifestyle that included basketball, football, softball, skiing and other sports at Penn, Dr. Millstein discovered his love of sports could be incorporated into his career. He then attended medical school at UPenn, receiving the George Marshall Award for Excellence and graduating with AOA honors.

Dr. Eric Millstein has been recognized as a Southern California Super Doctor (a doctor directory that only lists the top 5% of physicians in each state) on more than one occasion for his expertise in orthopedic surgery and sports medicine.

During his medical training he attended the Rehabilitation Institute of Chicago for an externship in spinal cord injury and pediatric rehabilitation. He also explored research in a laboratory investigating the causes of a rare orthopedic genetic disease. After graduating from medical school, he completed his general surgery internship and orthopedic surgery residency at the prestigious University of Chicago Hospitals. 

Dr. Millstein spent the next eighteen months at the renowned Southern California Orthopedic Institute with an Orthopedic Fellowship in Sports Medicine and Arthroscopy. This advanced training included arthroscopic and minimally invasive surgery of the shoulder, hip, knee and ankle. Upon completion of his fellowship training, Dr. Millstein began his private practice in Century City, eventually relocating to Beverly Hills.

He is a member of the American Academy of Orthopaedic Surgeons, the American Orthopaedic Society for Sports Medicine and the Arthroscopy Association of North America. He is also Board Certified by the American Board of Orthopaedic Surgery.

Dr. Millstein has presented research on long-term outcomes of ACL reconstruction and arthroscopic rotator cuff repair. He believes ‘Knowledge is Power’ and continues to teach other surgeons complex arthroscopic techniques as a complement to his clinical practice. He enjoys sharing his knowledge and expertise by mentoring young med-students and participating in humanitarian work.

Dr. Millstein has been included in Castle Connolly’s Top Doctor listing because of his orthopedic expertise. The listing features some of the best orthopedic surgeons in the country and is based on peer nomination, extensive research, careful review and a comprehensive screening process.

The U.S News & World Report has also identified Dr. Millstein as one of the best orthopedic surgeons in the country, presenting him with the ”Top Doctor” award in 2012. The U.S. News rankings offer grounded guidance to supplement what patients learn from their healthcare providers and other sources.

Also in 2011 and 2012, Dr. Millstein received the prestigious Patients’ Choice Award, identifying him as one of California’s favorite physicians.

Dr. Millstein stays extremely active and enjoys playing basketball, skiing and running with his two dogs as much as possible. He is fluent in Spanish and participates in volunteer work with a suicide prevention program. Dr. Millstein also donates his time every month as a volunteer at the Venice Family Clinic.

See Dr. Millstein’s CV.

Tigran Garabekyan, MD, is a leading orthopedic specialist renowned for his expertise in treating shoulder, hip, and knee conditions. At Millstein Orthopedics in Century City, California, he offers a comprehensive range of joint-preserving and joint-replacement options tailored to patients of all ages. With a keen focus on labral tears, articular cartilage injuries, femoroacetabular impingement, hip dysplasia, osteitis pubis, hip tendon injuries, and osteoarthritis, Dr. Garabekyan integrates advanced techniques into his practice. 

Particularly skilled in hip arthroscopy and realignment osteotomies (PAO/DFO), Dr. Garabekyan is known for his holistic approach to hip dysplasia. His innovative method of performing hip arthroscopy without a perineal post allows for simultaneous bilateral procedures, significantly reducing recovery time and expediting patients' return to their activities.

An accomplished researcher and academic, Dr. Garabekyan has authored numerous journal articles, textbook chapters, and online publications in orthopedic surgery. His research explores acetabular dysplasia, femoral torsion, and capsular management during hip arthroscopy. He has also been a sought-after speaker at national and international conferences, sharing his insights and research findings.

In addition to his clinical and research expertise, Dr. Garabekyan served as the Assistant Team Physician for Marshall University in Huntington, West Virginia, where he treated sports injuries in Division One athletes and played a crucial role in their return to competitive play.

Fluent in English and Armenian, Dr. Garabekyan provides compassionate care and advanced treatment options to a diverse patient base, helping them achieve optimal outcomes and improve their quality of life.

Welcome to the practice of William Sheppard, MD, MPH, in Santa Monica, California. As an expert orthopedic surgeon, I and my staff use our years of spine surgery experience to deliver lasting pain relief, improved mobility, and a better quality of life to our patients.

Our office is inside the UCLA Health Spine Center. Ample on-site parking is available, and we offer cutting-edge diagnostics, including X-rays, MRIs, and CT scans.

The collaborative treatment process we use emphasizes patient participation and feedback. Instead of making blanket treatment recommendations, we dedicate time to our patients, listening to their symptoms, concerns, and goals. We use that information to develop outcome-oriented treatment plans.

People from all over Los Angeles visit us for our spine expertise. We regularly diagnose and treat common back problems, including degenerative spinal disorders like scoliosis, spinal stenosis, and spinal disc herniation.

Rather than relying on open surgery, we primarily recommend minimally invasive surgery. This looks different for each patient, but I specialize in several techniques, including cervical spine surgery, cervical spine replacement, lumbar spine surgery, laminoplasty, robotic surgery, and endoscopic spine surgery.

Minimally invasive spine surgery provides various benefits. It requires less anesthesia, causes less blood loss, and uses smaller incisions that heal quickly. It allows patients to return to their lives quicker and risks significantly fewer complications.

Don’t let back or neck problems keep you from living your best life. Take the first step toward pain relief today. Call the practice of William Sheppard, MD, to schedule a new-patient appointment, or book your visit online.

About Dr. Unal

Berkay Unal, MD, is a fellowship-trained, board-certified orthopedic surgeon specializing in minimally invasive, arthroscopic surgery with an emphasis on shoulder and knee disorders, sports injuries, and arthritis. He treats patients at Samimi Orthopedic Group at its Los Angeles area offices in Brentwood, West Covina, and Sherman Oaks, California. 

Dr. Unal completed his undergraduate studies at The University of California, Berkeley, earning his bachelor’s degree in molecular and cell biology. Following his undergraduate studies, he held a research position at The University of California, Irvine, where he was involved in multiple

publications in molecular biology and infectious disease. 

Dr. Unal realized his true passion was medicine and direct patient care. He attended medical school at The University of Southern California (USC) in Los Angeles, receiving his medical degree in 2011. He completed his orthopedic surgery residency at The University of Southern California (USC) in Los Angeles. Dr. Unal did an additional year of subspecialty training in sports medicine and arthroscopy at The University of Kentucky's Orthopaedic Sports Medicine Fellowship in Lexington. 

Dr. Unal started his practice in Bakersfield, California, treating high-complexity injuries. He brings his experience and expertise to the Samimi Orthopaedic Group team. 

Dr. Unal believes in a non-surgical approach as the initial step in treating most orthopedic conditions. He believes in a personalized approach and takes pride in providing knowledge and guidance to ensure his patients feel comfortable and informed.

He is a member of the American Orthopedic Society for Sports Medicine, the American Academy of Orthopaedic Surgeons, and the American Medical Association.

Dr. Unal enjoys spending time with his wife and his two daughters, weight lifting, hiking, exploring nature, snowboarding, and a variety of recreational sports in his free time. He likes to maintain an active lifestyle and aims to help his patients do the same.

Board-certified orthopedic surgeon Ramin Ganjianpour, MD, is the founder of North Valley Orthopedic Institute in Mission Hills and Tarzana, California. He treats the full range of orthopedic injuries and diseases, with special expertise in minimally invasive total joint replacement of the knee, shoulder, and hip.

Dr. Ganjianpour graduated magna cum laude from the Ohio State University College of Medicine in Columbus, Ohio, where he was a member of the Alpha Omega Alpha Honor Medical Society.

After an internship at the University of Southern California, Los Angeles County Medical Center, he finished his residency training in orthopedic surgery at the Albany Medical College, Albany Med Center, in Albany, New York. Then he completed a fellowship in total joint replacement and adult reconstruction at the Arthritis Institute in the Westlake neighborhood of Los Angeles. 

With a dedication to providing the best possible care, Dr. Ganjianpour is devoted to learning, keeping up with the latest orthopedic advances, and using them to improve his patients’ health. Dr. Ganjianpour is the chief of orthopedic surgery at Providence Holy Cross Medical Center in Mission Hills, California. 

Board-certified orthopedic surgeon Ramin Ganjianpour, MD, is the founder of North Valley Orthopedic Institute in Mission Hills and Tarzana, California. He treats the full range of orthopedic injuries and diseases, with special expertise in minimally invasive total joint replacement of the knee, shoulder, and hip.

Dr. Ganjianpour graduated magna cum laude from the Ohio State University College of Medicine in Columbus, Ohio, where he was a member of the Alpha Omega Alpha Honor Medical Society.

After an internship at the University of Southern California, Los Angeles County Medical Center, he finished his residency training in orthopedic surgery at the Albany Medical College, Albany Med Center, in Albany, New York. Then he completed a fellowship in total joint replacement and adult reconstruction at the Arthritis Institute in the Westlake neighborhood of Los Angeles. 

With a dedication to providing the best possible care, Dr. Ganjianpour is devoted to learning, keeping up with the latest orthopedic advances, and using them to improve his patients’ health. Dr. Ganjianpour is the chief of orthopedic surgery at Providence Holy Cross Medical Center in Mission Hills, California. 

Board-certified orthopaedic surgeon Samir Nayyar, MD, of the Sports Medicine and Orthopaedic Institute, specializes in joint replacement and reconstruction and loves helping people get back to an active, pain-free lifestyle. Dr. Nayyar sees patients at the practice's three locations in Victorville, Pomona, Barstow, Banning, and Loma Linda, California, office and relishes being able to make a positive impact on his patients' quality of life that's both immediate and long-lasting.

Dr. Nayyar was born in New York but relocated to Apple Valley, California, where he attended Granite Hills High School. He returned to New York to study for his medical degree at the State University of New York at Buffalo, receiving the Excellence in Pediatric Orthopedic Surgery Award and the SUNY Chancellor's Award.

During Dr. Nayyar's time at NYU Langone Orthopaedic Hospital in New York City, he trained under some of the most esteemed orthopedic surgeons, gaining experience in joint replacement and reconstruction and achieving a fellowship in orthopaedic surgery.

Dr. Nayyar uses innovative, minimally invasive techniques during surgery that reduce blood loss and postoperative pain, ensuring the experience is less traumatic for his patients. He sees patients of all ages, from children to seniors, and all walks of life, from athletes specializing in many different sports to older patients who just want to remain active and play with their grandchildren.

He undertakes a variety of surgical cases, performing delicate nerve repairs one day and major joint replacement surgery the next. He believes that while everyone feels fragile at times, people are extraordinarily resilient, and with the high-class treatment and ongoing support he provides, his patients can overcome their injuries.

Dr. Nayyar is proud of his ability to help patients regain mobility and find relief from pain and is excited about using his skills to assist people back home in the High Desert area of California, where he grew up.