Sam Ahn, MD

Sam Ahn, MD

Sam Ahn, MD joined North Bay Allergy & Asthma Associates in August 2017. Dr. Ahn has trained at some of the most elite institutions in the United States. He graduated from John Hopkins University with a degree in Biology. He then received his MD from Harvard Medical School and completed his Internal Medicine Residency at Yale in Connecticut. He completed his Allergy & Immunology Fellowship at Mount Sinai Medical Center in New York City. During his fellowship, he authored several abstracts and scientific papers relating to both food allergies as well as Common Variable Immune Deficiency (CVID).

Prior to joining North Bay Allergy and Asthma Associates, Dr. Ahn practiced in Phoenix, Arizona for 7 years. While there, he was the Vice President of the Arizona Allergy & Asthma Society. He received numerous accolades, including “America’s Top Physician” several years. Other awards include Patient’s Choice Award, Compassionate Doctor Award and Castle Connolly’s Top Doctor Award. Most recently, he received the SF Magazine top doctor and Sonoma Magazine top doctor awards. Dr. Ahn has a special interest in volunteering his medical services throughout his career and has volunteered in medical clinics in various countries in Africa, as well as refugee clinics and free clinics here in the US.

Outside of medicine, his other interests include music, art, traveling, all things food and his two dogs.

Amber Keenan, NP

Amber Keenan, NP

Amber Keenan is a board certified family nurse practitioner joining North Bay Allergy and Asthma Associates. Amber graduated with honors from Simpson University and worked in the nursing profession for over 10 years before deciding to advance her career. Her nursing experience includes: emergency room, obstetrics, and post surgical care.

She received her Masters in Nursing from Sonoma State University in 2017. She has been working in Chico, CA as a nurse practitioner until her recent move to Napa. Clinically, she managed patients in the hospital and outpatient setting, including those in the intensive care unit. She has been told by staff and patients that she is attentive, thorough, and goes above and beyond.

Amber has relocated with her husband, 3 year old son, and 6 year old boxer. Her husband was born and raised in Napa and works as a firefighter for the city of Sacramento. They have moved to be closer to family and she could not be more excited to get to live and practice in such a beautiful area. Outside of work she loves to cook, camp, hike, and travel.

Ron Renard, MD

Ron Renard, MD

Ronald Renard, M.D. is board certified in adult and pediatric allergy/immunology as well as internal medicine. He has been practicing in northern California since 1984. He graduated with a degree in French language and history from University of San Francisco after spending a year in France on a Rotary Foundation Scholarship. He then received his MD from Creighton Medical School in Omaha. He became a medical officer in the US Army, attaining the rank of lieutenant colonel. He served as assistant chief of allergy at Walter Reed Army Medical Center. He has co-authored articles on asthma management. After leaving the Army, he moved to private practice in northern California where he has lived since 1984.  Since 1982, he has had various teaching appointments with the Uniformed Services University of Health Sciences in Bethesda, MD, and UC Davis School of Medicine.

He currently lives happily with his wife while enjoying biking, hiking, and the nature that California offers. He loves visiting children and grandchildren who live from California to Virginia.

He is joining North Bay Allergy & Asthma on a part-time basis and we are thrilled to welcome Dr. Renard to the North Bay Allergy family.



Monday - 9:00 am - 5:00 pm

Tuesday - 9:00 am - 5:00 pm

Wednesday - 9:00 am - 7:00 pm

Thursday - 9:00 am - 5:00 pm

Friday - 9:00 am - 12:00 pm


Napa Allergy Shot Hours

Monday - 9:00am - 12:00pm; 2:00pm - 6:00pm

Tuesday - 9:00 am - 12:00pm

Wednesday - 10:00 am - 12:00 pm; 2:00 pm - 6:30 pm

Thursday - 2:00 pm - 6:00 pm

Friday - 9:00 am - 12:00 pm


Sonoma Allergy Shot Hours

Monday - Closed

Tuesday - 2:00pm - 5:30pm

Wednesday - Closed

Thursday -  9:00 am-12:30 pm          2:00 pm - 5:30 pm

Friday - Closed