Introduction: Szczeklik's contributions to our understanding of aspirin, NSAIDs, asthma, and allergy.

Andrew Szczeklik was born in 1938 and died on Feb 3rd, 2012. He was the most influential expert in the field of aspirin and NSAID sensitivity reactions and associated diseases in the world. This edition of NACAI is dedicated to Andrew. In the introductory chapter, we elected to highlight his accomplishments as reflected in his publications. Andrew published at least 503 articles including many invited review articles. We present 20 of his most important publications all of which contributed significantly to our understanding of these diseases.