Leadership is important

Our Team Leaders are the best in their fields

With 18 professionals on staff, the Los Angeles Orthopaedic Surgery Specialists team provides the best in surgery, rehabilitation and personalized care.

Team

Meet some of our team members available through our offices in Southern California.

Kevin Pelton, MD

Kevin Pelton, MD

Owner / President

Dr. Pelton is the President and Chief Operating Officer of Los Angeles Orthopedic Surgery Specialists. As a board-certified orthopedic surgeon, his clinical practices focus on treating injuries in patients from all walks of life.
A native of Texas, Dr. Pelton graduated from Texas A&M University with a degree in Biomedical Science. After earning his medical degree from the University of Texas Southwestern Medical School in 2001, he completed a residency in Orthopedic Surgery and a fellowship in Orthopedic Trauma at USC. Dr. Pelton is a member of the California Orthopaedic Association, the American Academy of Orthopaedic Surgeons, the Los Angeles County Museum of Art, and the American Academy of Magical Arts.
From complex to minimally invasive surgery, Dr. Pelton is an expert in his field. Many local orthopedic surgeons in Southern California refer complicated cases to Dr. Pelton due to his level of experience and outcomes. As an industry leader in orthopedic surgery, Dr. Kevin Pelton has transformed many of his patients’ lives and is ready to help them thrive and live pain-free.
Dr. Pelton is available for patient care at the Los Angeles, Encino, and Valencia locations.

Matthew D. Longacre, MD

Matthew D. Longacre, MD

Surgeon

Dr. Matthew Longacre is a board-certified physician who specializes in Orthopedic Surgery and Sports Medicine. Originally from Southern California, Dr. Longacre earned his undergraduate degree in Biomedical Sciences at the University of California, Riverside, and his medical degree from the David Geffen School of Medicine at UCLA in 2008. He completed a residency in Orthopedic Surgery at USC Medical Center. Dr. Longacre is a member of the California Orthopaedic Association and the American Academy of Orthopaedic Surgeons.
Intrigued by the constant challenge to stay abreast of the latest technologies and procedures within the orthopedic specialty, Dr. Longacre enjoys interacting daily with patients and using his surgical skills to improve patient disabilities.
Dr. Longacre is available for patient care at the Los Angeles, Encino, and Valencia locations.

Felipe Nunez, PA-C

Felipe Nunez, PA-C

Vice President of Medical Affairs

Felipe Nuñez, Vice-President of Medical Affairs, is a bilingual board-certified physician assistant specializing in orthopedic care. A native Angeleno, Felipe earned his undergraduate degree from California State Polytechnic University, Pomona, majoring in Sports Medicine with a minor in Physiology and his Master of Science Degree in Physician Assistant Studies from Western University of Health Sciences. Felipe has obtained membership with state and national organizations and holds NCCPA certification (National Commission on Certification of Physician Assistants).
Felipe joined LAOSS in 2010 and works directly with Dr. Kevin Pelton, specializing in the treatment of patients with back, neck, hip, leg, shoulder, or knee pain and disorders. Felipe is also the first assist in the operating room with total joint replacements, revisions, open and arthroscopic procedures, and fracture care. Compassionate and committed, Felipe strives to provide excellent medical care, guidance, and support to patients throughout diagnosis, treatment, and recovery. When he is not in the office, he loves to play basketball and spend time with his family!
Felipe is available for patient care at the Los Angeles location.

Ali Najafi, MD

Ali Najafi, MD

Neurosurgeon

ALI NAJAFI, MD
Neurosurgeon
Dr. Najafi is a board-certified, fellowship-trained neurosurgeon who specializes in the surgical treatment of spinal disorders. Dr. Najafi received his undergraduate degree in Chemistry at Missouri State University with the highest honors. He then went on to the University of Missouri School of Medicine, graduating at the top of his class, followed by a Neurosurgery residency at Case Western Reserve University in Cleveland, Ohio. Dr. Najafi finished his skull base fellowship at the renowned Semmes-Murphy Clinic in Memphis, TN.
Having performed over 6,000 complex spinal surgeries in the last 20 years, Dr. Najafi is recognized for his patient operative skills, expertise, and compassionate care.
For optimal results, Dr. Najafi uses a multi-faceted and disciplined approach to assess each surgery. His goal is to treat each patient with the latest surgical and non-surgical tools to achieve the best treatment outcomes with minimal risk and recovery time.
Dr. Najafi is available for patient care at the Los Angeles location.

Erik Matthew Dworsky, MD

Erik Matthew Dworsky, MD

Orthopedic Surgeon

Originally from Southern California, Dr. Dworsky earned his undergraduate degree at the University of California, Berkeley, and his medical degree from the Case Western Reserve University School of Medicine in Cleveland, Ohio. He completed his orthopedic surgery residency at the University of California, Los Angeles, and completed an arthroplasty fellowship at the University of California, San Diego.

Dr. Dworsky has extensive training in all musculoskeletal complaints and advanced training in hip and knee replacement. He enjoys building trusting relationships with his patients and prioritizing patient education. Moreover, his revision arthroplasty training allows him to help patients who are having problems with their current joint replacement.

Dr. Dworsky is a member of the American Academy of Orthopaedic Surgeons (AAOS) and the American Association of Hip and Knee Surgeons (AAHKS). He has numerous orthopedic publications in academic journals and has given talks at both national and international conferences.

Dr. Dworsky is available for patient care at the Los Angeles and Tarzana locations.

Menyoli Michael Malafa, MD

Menyoli Michael Malafa, MD

Hand Surgeon, Plastic Surgeon

Dr. Malafa, a Plastic and Reconstructive Surgery Specialist, received his undergraduate degree in Biology at Stanford University. Upon graduating with honors from the University of South Florida College of Medicine in 2011, he completed his hand surgery residency at UT Southwestern. He completed a hand surgery fellowship at UCLA. Having more than nine years of diverse experiences, especially in Plastic and Reconstructive Surgery and Hand Surgery, Dr. Malafa performs all surgical hand procedures, including fracture repair, joint replacement, nerve, and tendon repair. He has vast experience in successful non-operative and rehabilitative treatment techniques that avoid surgery. He treats all patients, both young and old, with varied backgrounds, including the injured worker, non-athlete, and athlete, and takes pride in treating each patient as individuals and tailoring care to their specific needs and complaints.

Dr. Malafa is available for patient care at the Los Angeles and Tarzana locations.

Michelle Sugi, MD

Michelle Sugi, MD

Orthopedic Surgeon

Dr. Sugi is a board-certified fellowship-trained orthopedic surgeon who specializes in general pediatric orthopedic surgery and sports medicine. Dr. Sugi combines her love of healing, her passion for children’s health and development, and her intellectual drive to improve patient outcomes.
She is dedicated to supporting children’s health from birth to young adulthood with bone, joint, and muscle problems.
Dr. Sugi, a Southern California native, earned her undergraduate degree in Bio-Medical Engineering from the esteemed Johns Hopkins University in Baltimore, Maryland. She then entered medical school at the David Geffen School of Medicine at UCLA, earning her MD degree, followed by a residency at the University of Southern California-LAC+USC Medical Center. She also completed dual fellowships at UCLA Medical Center and Stanford University.
Dr. Sugi is committed to pioneering innovations and approaches to a full range of complex pediatric and sports orthopedic conditions, including fractures, injuries, spine disorders, neuromuscular weakness, and hip, hand, and joint abnormalities. Dr. Sugi enjoys spending her free time with her family and friends. She enjoys traveling, hiking, swimming, skiing, and all outdoor activities.
Dr. Sugi is available for patient care at the Los Angeles and Tarzana locations.

Matthew Nalamlieng, DPM

Matthew Nalamlieng, DPM

Doctor of Podiatric Medicine

MATTHEW D. NALAMLIENG, DPM
Podiatrist, Surgeon
Dr. Nalamlieng, a Southern Californian native, specializes in both the surgical and conservative treatment of the foot and ankle. After receiving his undergraduate degree in Science from The Master’s University, he completed his podiatric medical degree at the Western University College of Podiatric Medicine in Pomona, California, graduating as a Pi Delta Honor Society member.
He then completed a three-year integrated podiatric medicine and surgery residency with an added credential in reconstructive rearfoot/ankle surgery at the White Memorial Medical Center, where he served as a member of the Center for Limb Preservation & Advanced Wound Care. He completed additional training in advanced techniques in lower extremity reconstruction at USC Keck Medical Center as chief resident.
A member of several industry organizations, Dr. Nalamlieng is active with the American Podiatric Medical Students Association, the American Podiatric Medical Association, the American College of Foot and Ankle Surgeons, the American Board of Podiatric Medicine, the American Public Health Association, and the Western University College of Podiatric Medicine. Dr. Nalamlieng is happiest when his patients leave his care with improved function and return to their active lifestyles.
Dr. Nalamlieng is available for patient care at the Los Angeles location.

David Barba, MD

David Barba, MD

Orthopedic Surgeon

DAVID BARBA, MD
Orthopedic Surgeon
Dr. Barba is a bilingual board-certified orthopedic surgeon trained to treat and diagnose all injury forms to the musculoskeletal system, including the joints, muscles, bones, tendons, and ligaments.
Dr. Barba earned his undergraduate degree at San Francisco State, majoring in Physiology. After completing medical school at UCLA, Dr. Barba completed his orthopedic residency at Indiana University School of Medicine and subsequently participated in a sports medicine fellowship in Phoenix, Arizona, with the Orthopedic Clinic Association.
Dr. Barba finds it rewarding to help patients return to activities that they love doing but once thought were too painful or challenging to do and values the importance of providing his patients with quality care for their individual needs.
Dr. Barba is available for patient care at the Los Angeles location.

David Moriel, NP AGACNP

David Moriel, NP AGACNP

Nurse Practitioner

David Moriel, a native Angeleno, is a bilingual Nationally Accredited Board-Certified Nurse Practitioner. After completing his undergraduate studies at the Interamerican University of Puerto Rico with a degree in Nursing, he completed a Master of Science Degree in Nursing from Walden University.
David worked in the Subspecialty & Critical Care settings at White Memorial, LAC+USC, and USC Keck Medical Centers before joining LAOSS in 2019. He has experience in critical care, fracture care, wound care management, suturing and assisting during surgical procedures, giving injections, and monitoring and treating patients pre- and post-surgery.
David is ANCC (American Nurses Credentialing Certification), and BLS/ACLS certified.
David enjoys staying up to date on the most current practice recommendations by frequently attending continuing education courses based on the advanced critical care provider’s formation. During his spare time, David enjoys traveling, working out, reading, and spending time with family.
David is available for patient care at the Los Angeles location.

Mark Lee, PA-C

Mark Lee, PA-C

Physician Assistant

Mark Lee, PA-C is a board-certified Physician Assistant specializing in Orthopedic & Occupational Medicine. Mark received his Bachelor of Science degree in Public Health and Physician Assistant studies from Charles Drew University of Science and Medicine.
With over eight years of extensive experience as a primary care practitioner, Mark joined LAOSS in 2018 and is committed to providing the best care for patients with acute and chronic orthopedic conditions. When he is not in the office, Mark enjoys hiking and listening to music.
Mark is available for patient care at the Los Angeles location.

Natalie Hammond, PA-C

Natalie Hammond, PA-C

Physician Assistant

Natalie Hammond, PA-C is a board-certified Physician Assistant specializing in Orthopedic & Occupational Medicine.
A graduate of Charles Drew University, Natalie received her Bachelor of Science Degree in Physician Assisting Studies.
With over a decade of experience working closely with patients, Natalie provides only the best care for her patients at LAOSS. Natalie is a past member of the Board of Respiratory Care in California.
Natalie is available for patient care at the Encino, Tarzana, and Valencia locations.

Nora Nazarian, PA-C

Nora Nazarian, PA-C

Physician Assistant

Nora Nazarian grew up in the San Fernando Valley. She received her Bachelor of Arts in Psychology with a minor in Child Development at UCLA. Nora has three years of experience working as a clinical research coordinator on published research articles with four publications to her name, one of which she was the second author. During her first clinical clerkship at Keck School of Medicine Physician Assistant Program, Nora found her passion for orthopedic surgery.

As a Physician Assistant, Nora Nazarian is a medical provider able to work autonomously in the clinic and assist the LAOSS surgeons in surgery. She sees LAOSS Worker’s Compensation patients and private patients, including pediatrics.

Nora enjoys traveling, exploring new restaurants, and spending time with family & friends in her free time.

Nora is available for patient care at the Encino, Tarzana, and Valencia locations.

Luigi Galloni, MD

Luigi Galloni, MD

Physician
Yung Rak Cho, MD

Yung Rak Cho, MD

Physician
Jonathan Naick, PA-C

Jonathan Naick, PA-C

Physician Assistant
John Gianini, PA-C

John Gianini, PA-C

Physician Assistant
Daniel Rivas-Tejada, PA-C

Daniel Rivas-Tejada, PA-C

Physician Assistant
Michelle Chang, PA-C

Michelle Chang, PA-C

Physician Assistant
Andrew Chung, PA-C

Andrew Chung, PA-C

Physician Assistant
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