Meet Our Team
Dr. Ratiner is also a frequent speaker at local hospitals to physicians and at community centers to patients on topics such as osteoarthritis, rheumatoid arthritis, gout, osteoporosis, lupus, and fibromyalgia. Dr. Ratiner has recently authored several book chapters on osteoarthritis and research papers on Hepatitis C arthritis. Dr. Ratiner is also fluent in Russian.
Clinical Instructor of Rheum Cedars/UCLA,
MS Ultrasound Course,
So Cal Rheum Society lectures,
Tarzana Hospital Noon Conferences,
Monthly Journal Club Cedars/UCLA,
Weekly Journal Updates Review,
Yearly Lupus Review Course at ACR,
Yearly Rheumatoid Arthritis Therapy Update at ACR,
Yearly attendance at American College of Rheum meetings
Staff Physician at Northridge Family Practice Residency
Staff Physician at West Hills Medical Center
Staff Physician at Cedar-Sinai Providence Tarzana
At the urging of her patients, Dr. Oh has studied the medical benefits of Eastern medicine. She incorporates her knowledge in both Western and Eastern medicine in developing treatment plans that are unique to the individual patients’ needs.
Tarzana Hospital Noon Conferences,
regular CME attendance,
Monthly Journal Club Cedars/UCLA,
Weekly Journal Updates Review
Clinical Instructor Northridge Hospital FP Program,
Staff Physician at Cedar-Sinai Providence Tarzana Medical Center
- Born and raised in Southern California, Dr. Kreitenberg received his Bachelor of Science (B.S.) from the University of California, Los Angeles (UCLA) in the field of Physiological Sciences. Traveling across the world, he received his medical degree at the prestigious Technion – Israel Institute of Technology in Haifa, Israel.
- Upon completing medical school, he relocated to Southern California where he finished his Internal Medicine Residency, followed by Rheumatology Fellowship, at the University of Southern California (USC) and Los Angeles County Medical Center.
- Many of our rheumatology patients suffer from debilitating conditions such as osteoarthritis, rheumatoid arthritis, lupus, fibromyalgia, psoriatic arthritis and gout. As the newest addition to the practice, he possesses a fresh and unique approach to the practice of rheumatology. He is extremely passionate and strives to combine his clinical training skills with the latest in rheumatology research advances to help improve patients’ quality of life. Communication, as well as compassionate efficient care, are his strong-suits.
- Dr. Kreitenberg is board certified in both internal medicine and rheumatology. He has is currently seeing patients at several nearby hospitals in the San Fernando Valley including Northridge Hospital Medical Center and West Hills Hospital. He is fluent in English, Spanish and Hebrew
- Areas of interest:
- Rheumatoid Arthritis
- Osteoarthritis
- Spondyloarthropathies
- Lupus
- Scleroderma
- Mixed Connective Tissue Disease
- Sarcoidosis
- Osteoporosis
- Gout
- Inflammatory Myopathies
- Vasculitis
Southern California Rheumatology Society Lectures
Providence Tarzana Medical Center, Noon CME Conferences
Northridge Hospital Medical Center, Noon CME Conferences
Providence Tarzana Medical Center Grand Rounds
Ms. Magid has decades of experience in the medical field. Since 2004, she has been specializing in Rheumatology and working with Dr. Ratiner, Dr. Oh and Dr. Kreitenberg at RTMC.
In 2009 she received her Masters degree in Advanced Physician Assistant Studies with emphasis in Rheumatology from A.T. Still University in Mesa, Arizona.
Larisa Magid is also fluent in Spanish and Russian.
200 hr/yr of CME,
Osteoporosis Course Review,
Herbal Medication Comprehensive Review Course
About Us
Rheumatology Therapeutics Medical Center is a comprehensive center, located in the Los Angeles area, that specializes in the treatment of diseases that affect joints, muscles, and bones. Many of these diseases also involve the immune system.
Our center is staffed by medical doctors board certified in Rheumatology and Internal Medicine and by allied health professionals that are experienced and caring. By offering on-site Rheumatology Consultative Services, X-ray, DEXA, MRI, Laboratory, Physical and Occupational Therapy, Clinical Trials, and Infusion Services we make your total care convenient for you.
RTMC is located in San Fernando Valley of Los Angeles. The center is only two blocks east of Reseda Blvd., on the corner of Ventura Blvd. and Avenida Hacienda, south side of Ventura Blvd. The center is also across the street from Providence Cedars-Sinai Tarzana Hospital, a leading hospitals in Los Angeles. The area around the center also has multiple pharmacies, grocery and retail stores, as well as a multitude of multicultural restaurants.
In an effort to accommodate our patients we have assembled an all star international staff. Different languages spoken by our staff to accomodate you include: English, Spanish, Russian, Farsi, Tagalog, Korean, Hebrew, Armenian, Japanese and Ukrainian.