Trust Our Expert Allergists At OBA (Oak Brook Allergists)
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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.

Immunotherapy for Peanut Allergy

OBA offfers Peanut oral immunotherapy (OIT). An OIT program is designed to desensitize patients to their food allergen through daily exposure to the food. This approach provides a unique opportunity to monitor the natural course of peanut allergy and investigations of immunological outcomes.


You can breathe easier knowing our board certified allergists, physician assistant, nurse practitioner, and registered nurses 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


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