Section: Latest News

Annadel Medical Group continues retiring Healdsburg pediatrician’s practice, adds neurology and six more physicians


(Santa Rosa, Calif.March 20, 2014) Annadel Medical Group has assumed the practice of a newly retired Healdsburg pediatrician, Dr. Damian Marsden, who retired in December after 33 years of practice. The group also recently added six more Santa Rosa-based physicians. These new physicians increase to 70 the number of doctors who are part of Annadel Medical Group, which partners with the St. Joseph Heritage Healthcare medical practice foundation and Santa Rosa Memorial and Petaluma Valley hospitals.

Dr. Marsden's patients are continuing to be seen at his longstanding office location at 445 March Ave., Suite A in Healdsburg, and will receive quality pediatric care as part of the Annadel Medical Group.

With this latest influx of physicians, Annadel has added neurology to its roster of specialties, while also expanding access to care from newly recruited physicians who practice obstetrics/gynecology, gastroenterology, family medicine and critical care. The following physicians are now seeing patients:

Leo Smith, MD – Family Medicine
Dr. Smith grew up in Oregon and has a bachelor's degree from Oregon State University in secondary science education. He attended medical school at Oregon Health Sciences University and enjoys educating his patients on their medical conditions and appropriate treatment options so they can be knowledgeable participants in their own health care. Dr. Smith chose family medicine because of its focus on people of all ages, and enjoys being able to see patients from multiple generations within a family. Dr. Smith has been in practice for five years, most recently with the Portland Clinic in Oregon.

Gina Chen, MD – Critical Care Intensivist
Dr. Chen completed her medical degree at the University of Wisconsin School of Medicine and her residency in internal medicine at Indiana University Health. She completed her fellowship in pulmonary and critical care at University of Michigan Health and fellowship in sleep medicine at Stanford University Medical Center. Dr. Chen specializes in critical care medicine, internal medicine, pulmonary disease, and sleep medicine. She has been in practice for more than 13 years, most recently with NPCS Medical Practice in Ohio.

Drew Ludwig, DO – Critical Care Intensivist
Dr. Ludwig is board certified in critical care and internal medicine. He attended medical school at Michigan State University College of Osteopathic Medicine, completed his internal medicine residency at Swedish Covenant Hospital and completed his critical care fellowship at Midwestern University in Illinois. Dr. Ludwig has been in practice for three years, most recently with the neurocritical care unit with the Methodist Hospital Physician Organization in Texas.

Mehri Khatibi, MD – Obstetrics/Gynecology and Laborist
Dr. Khatibi is board certified in obstetrics and gynecology. She completed her medical degree at Isfahan University of Medical Sciences in Iran and her residency in obstetrics and gynecology at Saint Louis University in Missouri. Dr. Khatibi has been in practice for more than 15 years, most recently in Modesto. She recently relocated to Santa Rosa and is looking forward to opening Annadel Medical Group's first obstetrics and gynecology practice in Santa Rosa on Monday, March 24.

Zachary Lewton, MD – Neurology
Dr. Lewton completed his medical degree at the University of Rochester School of Medicine and his residency in neurology at University of Michigan Health System. He completed fellowships in clinical research and neuroscience at the National Institute of Mental Health and a fellowship with the American Association of Neuromuscular and Electrodiagnostic Medicine. Dr. Lewton has a broad range of expertise in general neurology and uses a holistic approach to patient care. He has been in practice for more than ten years, most recently with Neuroscience Associates Inc. in Ohio.

Razi Arifuddin, MD – Gastroenterology
Dr. Arifuddin is board certified in gastroenterology and internal medicine and provides advanced gastroenterology procedures such as capsule endoscopy and endoscopic ultrasound (EUS). He is also trained in hepatology with a wide exposure to pre-transplant and post-transplant liver patients. Dr. Arifuddin completed his medical degree at St. George's University School of Medicine, his residency in internal medicine at Drexel University in Pennsylvania, and his fellowship in gastroenterology at Strong Memorial Hospital in New York. He has been in practice for more than 12 years, most recently with Texoma Gastroenterology Consultants in Texas.

"Annadel Medical Group is pleased to continue the expansion of services and specialties offered in Sonoma County," said David Smith, President of Annadel Medical Group. "Not only are we honored to offer quality pediatric care to the Healdsburg community with the same compassion that Dr. Marsden did for the past 33 years, but we are pleased to welcome this diverse group of primary care doctors and specialists to our local medical community."

Drs. Smith, Lewton, Arifuddin, and Khatibi look forward to meeting and caring for patients in their respective Santa Rosa medical offices. Dr. Smith is located at 500 Doyle Park Drive Suite G04; Dr. Lewton at 1194 Montgomery Drive; Dr. Arifuddin at 85 Brookwood Ave., Suite 10; and Dr. Khatibi at 500 Doyle Park Drive, Suite G03 (effective March 24). To make an appointment or for more information, patients can visit

About Annadel Medical Group
Annadel Medical Group, along with St. Joseph Heritage Healthcare, is a part of St. Joseph Health – an integrated health care delivery system founded by the Sisters of St. Joseph of Orange and sponsored by the St. Joseph Health Ministry. Our physicians are medical staff members at Santa Rosa Memorial and Petaluma Valley hospitals, ensuring that our patients have access to the advanced, comprehensive resources of St. Joseph Health. With more than 80 providers serving local residents in Sonoma County, our practitioners have the expertise to provide compassionate, quality care for the entire family, through every stage of life. Annadel accepts most major insurance plans including commercial/PPO, HMO, Medicare, Medi-Cal/Partnership Healthplan, Western Health Advantage, and select Covered California exchange plans. More information may be found at

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