Gregg P. Hartman, MD, is a board-certified orthopedic surgeon serving patients in Simi Valley and Thousand Oaks, specializing in sports medicine and arthroscopic surgery. A member of Ventura Orthopedics since 1997, Dr. Hartman earned his medical degree from Tulane University and completed his orthopedic residency at the University of New Mexico.He also completed a sports medicine fellowship at the Los Angeles Orthopedic Institute. Dr. Hartman serves as the sports medicine physician for two local high schools and frequently lectures at area universities.Outside of work, he enjoys skiing, martial arts, and spending time with his wife, three children, and three dogs in Camarillo.

Joseph P. Turk, MD, is a board-certified orthopedic surgeon serving patients in Thousand Oaks specializing in hip and knee replacement, complex revision surgery, trauma, and general orthopedics. He earned his undergraduate degree from UCLA and his master’s in medical imaging sciences from Chicago Medical School, where he also received his medical degree. Dr. Turk completed his residency at the University of Pennsylvania and a fellowship in hip and knee reconstructive surgery at the Anderson Orthopaedic Clinic. He joined Ventura Orthopedics in 2005 and has contributed to multiple orthopedic journals. Dr. Turk lives in Ventura County with his wife and two sons.

Kimberley K. Caputo, MD, is a board-certified orthopedic surgeon specializing in pediatric orthopedics. A Newbury Park resident since 1982, she earned her degree in biology and psychology from California Lutheran University. Dr. Caputo completed her medical training at UCLA, followed by a fellowship in Pediatric Orthopaedic Surgery at Shriners Hospitals. She has extensive experience with both rare and common pediatric conditions. Dr. Caputo is an active member of the American Academy of Orthopaedic Surgeons and Pediatric Orthopaedic Society of North America. She lives in Newbury Park with her husband and six children.

Michael J. Fealy, MD, is a board-certified hand surgeon specializing in complex hand and wrist conditions, proudly serving patients in Simi Valley and Thousand Oaks. He provides expert care for injuries, nerve conditions, arthritis, fractures, and other hand and wrist issues. Dr. Fealy earned his medical degree from George Washington University and completed both general and plastic surgery residencies at Stanford University, where he also completed a fellowship in Hand and Microsurgery. He is affiliated with multiple local hospitals and is a member of several leading surgical societies. Dr. Fealy has also volunteered his surgical expertise on international medical missions in Nepal and Peru.

Known for his patient-focused approach, Dr. Fealy is committed to delivering high-quality, personalized care. Outside the clinic, he enjoys coaching youth sports and cycling for charity.

Kamyar Assil, MD, is a highly experienced pain management physician based in Thousand Oaks, with over 20 years in practice. He specializes in diagnosing and treating pain through spine injections, nerve blocks, and other advanced techniques. Dr. Assil’s expertise includes managing conditions such as headaches, neck pain, herniated disks, and lower back pain. He is an active educator and expert in his field, serving as a senior instructor and lecturer at USC. Known for his holistic approach, Dr. Assil focuses on improving his patients’ quality of life through conservative treatments before considering surgery. He is also an avid outdoorsman and resides in Thousand Oaks with his family.

Timothy Rearick, MD, is a board-certified orthopedic surgeon serving patients in Thousand Oaks and Simi Valley, specializing in foot and ankle disorders, including sports injuries. Raised in Ventura County, he graduated magna cum laude from UCLA and earned his medical degree from the University of Miami, where he was inducted into the Alpha Omega Alpha Honor Society.
After completing his orthopedic residency at USC and LAC Medical Center, Dr. Rearick trained in foot and ankle surgery at Mercy Medical Center in Baltimore. Since joining Ventura Orthopedics in 2016, he has focused on treating trauma, arthritis, tendon disorders, and performing minimally invasive surgeries.
Outside of work, Dr. Rearick enjoys sports, travel, and spending time with his wife and three children.

Daniel K. Davis, MD, is a board-certified orthopedic surgeon specializing in advanced arthroscopic and reconstructive techniques for the shoulder, elbow, and knee. Serving patients in Simi Valley, Thousand Oaks, and the surrounding areas, Dr. Davis utilizes minimally invasive procedures that promote quicker recovery and better outcomes compared to traditional methods. As a sports medicine physician, he is skilled in joint replacement surgery and the latest techniques for treating traumatic bone injuries, including intramedullary devices and locked compression plating. Additionally, Dr. Davis is the team doctor for Moorpark High School football, where he applies his expertise to ensure athletes receive the highest level of care.

Joanne H. Wang, MD, is an orthopedic surgeon serving patients in Thousand Oaks and Simi Valley, specializing in hand and upper extremity conditions. Raised in Cleveland, she graduated from Brown University and earned her medical degree from Brown’s Warren Alpert Medical School.
After completing her residency at University Hospitals / Cleveland Medical Center, Dr. Wang trained in Hand and Upper Extremity Surgery at the Cleveland Clinic, followed by a Shoulder Surgery fellowship at Rush University. She treats traumatic and degenerative conditions of the hand, wrist, elbow, and shoulder, performing procedures such as carpal tunnel release, tendon repair, and rotator cuff surgery. Dr. Wang is a member of the American Academy of Orthopedic Surgeons and the American Society for Surgery of the Hand.

Lakshmanan (Lucky) Sivasundaram, MD is a board-certified orthopedic surgeon specializing in sports medicine, shoulder, elbow, hip, and knee surgery, serving patients in Simi Valley and Thousand Oaks. A San Fernando Valley native, he earned his degree in Neuroscience from UCLA and his medical degree from USC, graduating with honors. He completed his residency at Case Western Reserve and a fellowship in Sports Medicine and Shoulder Surgery at Rush University, where he worked with the Chicago Bulls, White Sox, and Fire. Dr. Sivasundaram specializes in minimally invasive and joint preservation procedures. He is the team physician for Oak Park High School and enjoys golf, weightlifting, and trave

Olumuyiwa Idowu, MD is an orthopedic spine surgeon serving patients in Simi Valley and Thousand Oaks. Born in Trinidad and Tobago and raised in Staten Island, NY, Dr. Idowu developed a passion for medicine early, inspired by his parents’ careers in healthcare.
He earned his Biochemistry degree from Washington University in St. Louis and completed his medical degree at the University of Chicago Pritzker School of Medicine. Dr. Idowu completed his orthopedic surgery residency at LA County/Keck School of Medicine and a fellowship in orthopedic spine surgery at NYU Langone Health.
Dr. Idowu specializes in cervical, thoracic, and lumbar spine surgery, using advanced techniques including robotics, navigation, and minimally invasive procedures. He also provides general orthopedic care, emphasizing non-operative and personalized treatment plans to relieve pain and improve function.
Outside of work, Dr. Idowu enjoys traveling, staying active, and spending time with his wife and dog.

Ali R. Motamedi, MD, is an orthopedic surgeon serving patients in Camarillo and Thousand Oaks, specializing in sports medicine with a focus on knee and shoulder arthroscopy. He holds dual board certifications in Orthopedic Surgery and Sports Medicine.
After earning his medical degree from Tulane University, Dr. Motamedi completed his orthopedic residency at the University of New Mexico and fellowships at UCLA and the University of Vienna. He has also taught at UCLA and the University of Texas Medical School.
Dr. Motamedi is a fellow of the American Orthopedic Society for Sports Medicine, a former president of the Western Orthopedic Association, and currently serves as the team doctor for Adolfo Camarillo High School.

Kevin M. Deitel, MD, FRCS(C), is an orthopedic surgeon specializing in spine surgery, serving patients in Oxnard, Thousand Oaks, and surrounding areas. Born in New York City and raised in Toronto, Dr. Deitel earned his medical degree from the Medical College of Wisconsin and completed his orthopedic residency at the University of Toronto. He further honed his skills with a spine surgery fellowship at the University of California, San Diego. Board-certified in both orthopedic and spine surgery, Dr. Deitel is experienced in pain management and minimally invasive surgical techniques. Prior to joining Ventura Orthopedics, he practiced in San Diego for nine years. Dr. Deitel currently lives in Newbury Park with his wife and three children.