Zaidan studied in the Medical Sciences College of the American University of Beirut and graduated as a physician in 1916. He was one of the first foreign physicians to revalidate his diploma in Brazil where he practised obstetric medicine in Hospital Pró-Mater. He became popular for looking after the poor for free; his popularity led to his receiving in 1966 the title of Paulistano Citizen of the Municipal Chamber of São Paulo.[1]