He is the eldest son of late Prof Dr MA Mannan, former MP of Kishoreganj -2 constituency and late Prof Bashira Mannan of Dhaka University.
Ambassador-designate Mannan is a career foreign service officer who belongs to 1984 batch of Bangladesh Civil Service (BCS) Foreign Affairs cadre.
In his career, Mannan worked in various capacities at Bangladesh Missions in London, Muscat, New York and Beijing. He also served as Ambassador of Bangladesh to Morocco and Germany.
At the headquarters, he served in various capacities from the rank of Assistant Secretary to Additional Foreign Secretary.
Mosud Mannan obtained his Masters degree from the Fletcher School of Law and Diplomacy in 1989.
Earlier, he completed MSS in Economics and LLB from Dhaka University.
In 2006, he completed the yearlong National Defence Course from the National Defence College of Bangladesh.
In observance of 50 years of the Universal Declaration of Human Rights, he co-edited “Defying All Odds” jointly with Selina Hossain of Bangla Academy in 1999 which was published by UN Information Centre, Dhaka.
He took the initiative to publish two volumes of selected works of National Poet Kazi Nazrul Islam in Mandarin language during his assignment in Beijing.
He served as the President of London Diplomatic Association in 1995 and Chairman of Beijing DCMs Group from 2002-2005.
Mannan has been serving as the Chairman of the Afro Asian Ambassadors Group in Uzbekistan for the last three years.
He has been an active Rotarian since 1990 and also a former National Deputy Commissioner (International) of Bangladesh Scouts.