Prof. Dr. Ivan Čekerevac is one of the eminent experts in the field of pulmonology and he is a professor at the Faculty of Medical Sciences University of Kragujevac, and an internist-pulmonologist with many years of work at the Clinic for Pulmonary Diseases of University Clinical Center Kragujevac, Serbia. In his professional work, he devotes special research focus to patients with chronic obstructive pulmonary diseases and bronchial asthma, as well as researches in the field of additional pulmonary function tests that would improve the diagnosis of this chronic disease and treatment outcomes.