Date of Seniority Royal Navy 11 December 1809
William Porteus was appointed to the position of Assistant Surgeon in the Royal Navy on 19 December 1807. He was appointed Surgeon in 1809.
He was entered in the Navy List of Medical Officers in 1814
He was appointed to the Carron in 1818 (Edinburgh Magazine)
William Porteus was appointed Surgeon to the Dartmouth in 1824.
He was employed as surgeon superintendent on the convict ship Circassian arriving in Van Diemen's Land on 16 July 1833.
He was on the List of Royal Navy Surgeons who were unfit for service in 1841.
 Navy List