Sir William Addis KBE was born in 1901 in Japan, son of Sir Charles Addis. Married to Rosemary Gardner in 1929 and they have four sons. He was educated at Rugby, Madalene College, Cambridge. Sir William Addis KBE entered Colonial Service in 1924. He served Zanzibar and Northern Rhodesia; Private Secretary of Sultan of Zanzibar, 1939-45; Colonial Secretary, Bermuda, 1945-1950; Deputy Commissioner-general for Colonial Affairs, South-East Asia, 1950-53.
Sir William Addis KBE became Governor of Seychelles from 1953-58. He retired in 1958 and died in 1978.