[3] He asked his colleague at the Glasgow Royal Infirmary, James Cyril Dalmahoy Allan, to join his practice in 1909.
Dr. Fitzwilliams taught Practical Physiology and Pathology at the Hong Kong College of Medicine for Chinese from 1908 and 1909 and Anatomy from 1909 to 1912.
He was elected with 343 votes with A. Shelton Hooper, the incumbent Sanitary Board member against Dr. Raphael Aaron Belilios and Horace Percy Smith.
He was sent to Petrograd to work for his brother, Duncan Campbell Lloyd Fitzwilliams who headed Lady Muriel Paget's Anglo-Russian Hospital.
He was tasked with collecting intelligence about military and political positions of the nations in the Eastern Front and also sought to turn the side of from Ukraine from the Central Power when he moved to Southern Russia and then to Romania.