As board certified specialists in allergy, asthma and immunology we are experienced in treating adults and children with a wide variety of conditions (learn more about what it means to be a board certified allergist).

We are the longest standing Allergy and Asthma Center in western Colorado and the only board certified Allergy & Immunology specialists serving the Grand Valley, Delta and Montrose region.

Our staff is committed to providing personalized state of the art care to improve how you feel and to increase your quality of life. Our focus is on patient and family education as a central component of medical care, and we are willing to extend any amount of time and effort to ensure your well being. In summary, we want to provide you with optimal, outcome focused and cost-effective care in a friendly, patient-oriented setting.



William A. Scott, M.D. - Physician
Dr. William Scott received his training at National Jewish Health in Denver, which is the country's leading institute in respiratory disease. Dr. Scott is board certified by the American Board of Allergy and Immunology. More Info →

David R. Scott, M.D. - Physician
David R. Scott, M.D. is a physician with expertise in the evaluation and treatment of allergic, asthmatic and immunologic disorders. More Info →

Katherine S. Tille, M.D. - Physician
Katherine S. Tille, M.D. is a physician who specializes in the evaluation and treatment of a variety of allergic, asthmatic and immunologic disorders. More Info →


Cathryn E. Schnell, PA-C - Physician Assistant
Cathryn Schnell, PA-C, is a certified physician assistant who has worked in the field of asthma and allergy since 2010. She works closely with Dr. Scott to provide the highest quality care to their patients. More Info →