British surgeon William Wittman visited the Ottoman Empire between the years 1799 and 1802 as a member of the British Military Mission. The British Military Mission came to the Ottoman Territory in accordance with the alliance which was enacted between the Ottoman and British Empires after Napoleons' invasion of Egypt. William Wittman spent a year in Istanbul. Later on he went to Jaffa with the British Military Mission to join the Ottoman army. They traveled through El-Arish and Belbeis to Cairo with the army. During this time Wittman recorded the health problems and the diseases which were prevalent both in the Ottoman army and the British Military Mission. He also recorded the cases which he tried to cure. William Wittman appended three medical reports to his travel report. This article is on William Wittman's biography and his impressions of the Levant Chiflick in Istanbul; health problems, and diseases prevalent in Istanbul and its neighborhood during the period.