Born 1850, he entered army in 1870. When a Captain he transferred to the Bengal Staff Corps and in 1890, as a Major, joined the Indian Staff Corps. Mason served in Burma 1886-87 and he appears to have transferred back to the Indian Army in 1896 to command his Regiment.

He was a Colonel on the staff at Nowshera in 1903 and was a Brigadier-General in Bundelkund 1903-04, becoming a 2^nd Class District Commander when he took over as Political Resident in Aden from Maitland in April 1904.

He retired from the Army on leaving Aden in 1906. He died in 1929.