Sir William Marston Logan was born in 1889, son of Rev James Moffat Logan. Educated at Bristol and Brasenose College, Oxford. Married in 1920 to Janet Melntyre; had one son and one daughter. He was Assistant District Commissioner in East Africa 1913; Seconded Central Committee of supplies, 1914-15; Honorary Lieutenant 1915-17. Sir Logan became Administrative Officer in 1924 and Senior Local Government Commissioner 1926; Commissioner of Local Government Lands Settlement and Marines, 1933 and Chief Secretary, Northern Rhodesia in 1937.
Sir William Marston Logan was Governor of Seychelles from 1942-1947. The hospital on La Digue is named after him. He retired in 1947 and died in 1968.