During the 1965 war he the Chief Warden of Dacca and was later appointed Warden General of East Pakistan [REF].
Khawaja Hasan Askari was the guardian of the various philanthropic institutions like the Nawab Salimullah Orphanage, madrassah's supported by his family, Sir Salimullah Medical College, Ahsanullah Engineering College also supported by Nawab of Dhaka family.