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Welcome to Allergy & Asthma Associates of Southern California

For highly specialized allergy & asthma care, look to a recognized leader

It's nice to know you can turn to somebody who really cares about your health and who's been there for you, your family and your neighbors for over 30 years. That's Allergy & Asthma Associates of Southern California - because we're your friends and neighbors, too.

Our practice was founded in 1980 by Dr. William E. Berger. Today, along with his partner Dr. Warner W. Carr, and their outstanding team of physicians, Dr. Mark S. Sugar, they provide exceptional allergy and asthma care for children and adults. Together we’ve helped thousands of children and adults find welcome relief from allergies, asthma, sinus problems and other related conditions. It’s just one of many reasons why our current patients refer more than half of our new patients.

Another reason is that our doctors have established themselves as leaders in the field of allergy and asthma care. Through our Southern California Research Center, they have conducted leading-edge research and clinical trials for some of the largest pharmaceutical companies in the world. In addition, they’ve lectured across the country and held prominent positions in professional medical associations and top medical schools. Their efforts will help improve patient care for years to come.

Allergy & Asthma Associates of Southern California provides state-of-the-art diagnostic allergy testing and relief from the symptoms of seasonal allergies, sinus allergies, skin allergies, food allergies, gluten allergies, chronic sinusitis, asthma, exercise-induced asthma and pediatric asthma. Common symptoms may include difficulty breathing, runny nose, watery eyes, wheezing and chronic cough. We provide leading-edge treatments, including oral immunotherapy, for seasonal allergies, gluten allergies, sinus allergies, skin allergies and food allergies, including peanut allergies.

Together our team of doctors and staff specialize in allergy and immunology in southern Orange County, California, providing diagnosis and treatment for all types of allergies, asthma and skin conditions such as eczema.

Patients like the fact that our doctors and staff treat them just like family. Even children appreciate our friendly, unhurried and informative care because we make children’s allergy testing visits fun and positive experiences. Thanks to our highly specialized care, we can help you improve your health and quality of life right here in Mission Viejo and Irvine. We also serve the Orange County (OC), CA communities of Aliso Viejo, Coto de Caza, Dana Point, Ladera Ranch, Laguna Beach, Laguna Hills, Laguna Niguel, Lake Forest, Newport Beach, Rancho Santa Margarita, San Juan Capistrano and Talega.

Call (949) 364-2900 to schedule your appointment today with one of our allergy and asthma doctors. You can also use our online Request an Appointment form to schedule a future date and time.


Top 10 pediatricians in Mission Viejo, CA
Allergy & Asthma Associates of Southern California has been recognized as one of the top Mission Viejo Pediatrics practices.

What's New

Allergy and Asthma Associates has established the Food Allergy Center, the first and only one of its kind in Orange County, to focus exclusively on the diagnosis and now treatment of food allergy. We are now offering oral immunotherapy. The purpose of oral immunotherapy (OIT) is to decrease your sensitivity to allergy-causing foods, so that exposure to the offending food (peanut, milk, egg, tree nuts etc.) will result in fewer and less severe symptoms in the event of an accidental exposure.

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What Our Patients Say About Us

  • I couldn’t breathe, I couldn’t do anything that I wanted to do, let alone go out and do anything athletic with my children or for myself. Then I met Dr Berger. He changed my life – he put in the time, the effort and the extra research to get me the diagnosis and the correct medications that changed my life forever!... - Linda

  • When I first got diagnosed with asthma it started off as exercised induced but throughout the years it became worse than that. Just a wind would make me feel like I needed to take my inhaler, a change in the weather and I had to take a breathing treatment. It was really hard especially for being an athlete, because you don’t want anything holding you back from what you love to do...


Two Locations to Serve You!


27800 Medical Center Road
Suite 244
Mission Viejo,
CA 92691

Allergy & Asthma Associates of Southern California Map

15785 Laguna Canyon Road
Suite 100
CA 92618

Allergy & Asthma Associates of Southern California Map

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