He is a member of several professional organizations, including the International Academy of Oral Oncology, American Head and Neck Society, Brazilian Head and Neck Surgery Society, Brazilian Society of Otolaryngology and Brazilian College of Surgeons. He served as President of the IV Brazilian Oral Cancer Congress, President of the 8th International Congress on Oral Cancer, and President of the Brazilian Head and Neck Surgery Society (2005-2007). Dr Kowalski has authored or co-authored more than 450 peer reviewed articles (305 in international peer reviewed journals), written 3 Thesis and 100 book chapters, and edited 9 books. Dr Kowalski´s basic science and clinical interests are epidemiology, prognostic factors, oral and oropharyngeal cancer, thyroid cancer salvage surgery, management of the neck and biomarkers.