Your Network for Comprehensive Care

Annadel Medical Group offers the community a diverse group of doctors representing primary and specialty care. From preventive care to special programs for patients with chronic conditions, we have you covered. Our doctors specialize in internal medicine, pediatrics, neonatal care (newborn care), hospital medicine, pulmonology and more.

Annadel Medical Group is supported by St. Joseph Health System-Sonoma County. Our doctors are all active staff members at Santa Rosa Memorial Hospital and Petaluma Valley Hospital. As our patient, you have access to some of the best hospital care available in the area.

Pediatric Specialists:

• Deborah Britt, MD
• Elizabeth Culhane, MD
• Heather Iezza, MD
• Kenneth Prosser, MD
• David Smith, MD
• Mary Pat Degagne, RN, PNP
• Donna Lynn Jones, RN, FNP, PNP
• Linda Wayman, RN, PNP

Internal Medicine Specialists:

• Eki Abrams, MD 
• Marlon DeCastro, MD
• Noel Serrano, MD

Family Practice Specialists:

• James DeVore, MD
• Gary Greensweig, DO
• Jenny Sullivan, MD (arriving in October)

Hospice & Palliative Medicine:

• Gary Johanson, MD

Pulmonologist/Intensivist

• Daniel Loube, MD

Hospitalists:

• Jon-Michael (JM) Castelli, MD
• Attila Mady, MD
• Rachel Marek, MD
• Grace Martin, MD
• Andrew Min, MD
• Erin Studer, MD
• Brenna Yard, MD