He resigned along with three other advisers, namely, Hasan Mashhud Chowdhury, C M Shafi Sami and Sultana Kamal on the grounds of dissatisfaction with President Dr. Iajuddin Ahmed caretaker government.

According to them, there was no scope to contribute in the caretaker government to create a congenial atmosphere for holding a free and fair election.

After a foundation course at the Civil Service Academy in Lahore (1967–68), he was posted as the sub-divisional officer (SDO) of now defunct sub-district Habiganj in 1969.

As the Mujibnagar government was yet to be formed and war of liberation remained to be formally launched, many police officers disagreed to give arms and ammunition without a written order.

Khan fearlessly gave written note ordering to provide the freedom fighters with food and money.

Collecting from the sub-divisional treasury, he arranged to send nearly three Crore taka to Agartala by a truck to help run the Bangladesh Government to be formed on 17 April 1971.

Later he left Bangladesh, the then East Pakistan, and moved to Agartala, India across the border to physically participate in the war of liberation.

[4]He was sentenced to 14 years of rigorous imprisonment in absentia by a Pakistan military court for his active participation in the Liberation War of Bangladesh.

After completion of his tenure in Washington, Dr. Khan returned home and joined the Banking Division of the Finance Ministry as an Additional Secretary.

[6] As he retired, government chose to nominate him as Alternative Executive Director of the World Bank, Washington where he served until 2005.

[4] During the period of Sheikh Mujibur Rahman's Prime Ministership, a scandal arose in the Dhaka University teachers about being Rajakar or not.

In this connection, Dr. Khan said, "Every time I did not like or felt something that was against the law, I gave written notes, and in most cases, my experience is saying it was bound to be accepted".

He became a public face as he appeared in different TV Talk Shows to explain the current political and economic situation of the country.