Sir William Osler (1849-1919). “The practice of medicine is an art, not a trade, a calling not a business, a calling in which your heart will be exercised equally with your head.” Dr. Osler has been referred to as the 'Father of Modern Medicine'. He was the first to bring medical students to the wards for bedside teaching, which continues to be the major teaching method. He was a professor of Medicine at Johns Hopkins, McGill University and Oxford University. His book, Principles and Practices of Medicine, was published in 1920. Dr. Osler's contributions describing diseases and improving physical examination skills were numerous. His emphasis on taking a good history has benefited past, present and future patients and physicians.