Trust Our Expert Allergists

We’re here to help you breathe easier at any one of our four convenient locations, with extended office hours that fit your work schedule and busy lifestyle. Our physicians are also highly accessible; chances are we will get you in for an appointment, even at the last minute. Contact us today to schedule a visit with one of our adult or pediatric allergy specialists for a complete evaluation. We will recommend the best method of treatment to minimize your symptoms, allow you to feel well, be active and live a healthy, productive life.


You can breathe easier knowing our board certified allergists, registered nurses, and nurse practitioner have been providing relief for allergy and asthma sufferers for over 35 years. We provide the finest in allergy care with a goal of improving our patients’ quality of life..

David J. Knysak, M.D.

Raymond M. Pongonis Jr., M.D.

Jennifer K. Catalfio, PA-C

Tammy Laas, APN, MSN, FNP-BC


About Images

We know how busy you are, so we've added more office locations to fit your lifestyle. If you live in the Elmhurst, Naperville, Downers Grove or Plainfield, IL area chances are there is an Oak Brook Allergists office on your way to work or on the way home from school. We want to make it easier for you to receive the allergy and asthma care you need.