Haque was appointed the Education Minister of Pakistan in 1965. He was also the Minister of Health, Labour and Social Welfare. He retired in 1969 and joined the private sector. In 1975, following the Assassination of Sheikh Mujibur Rahman in the 15 August 1975 Bangladesh coup d'état, he joined the Council of Advisors and Ministers. He served in the cabinets of President Abu Sadat Mohammad Sayem, President Ziaur Rahman, and President Abdus Sattar. After retirement he wrote his memoir, Under Three Flags : Reminiscence of a Public Servant, about serving under the British, Pakistani, and Bangladeshi governments. In 1991 he wrote Quest of Freedom about the Bangladesh Liberation war.