Hailey was educated at Merchant Taylors' School and Corpus Christi College, Oxford and entered the Indian Civil Service in 1896.
The same year, he was raised to the peerage as Baron Hailey, of Shahpur in the Punjab and Newport Pagnell in the County of Buckingham.
[1] He subsequently spent time on missions to Africa, producing the African Survey in the late 1930s that proved very influential.
Lord Hailey died at Putney on 1 June 1969 and his ashes were taken for burial in the family vault at Simla in India.
[11] With his death, the barony became extinct, as his only son and heir, Alan Hailey (1900–1943) had been killed without issue in the Middle East during the Second World War.