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.


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 - 2:00 pm - 7:00 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