He holds MSS in Economics from the University of Dhaka and a master's degree in international relations from The Fletcher School of Law and Diplomacy in the United States.

Masud served as Director of Poverty Alleviation Department at SAARC Secretariat in Kathmandu, Nepal, from 2001 to 2004.

From 2006 to 2008, he was Director-General for Bangladesh's Ministry of Foreign Affairs, responsible for matters related to South Asia, the South Asian Association for Regional Cooperation (SAARC), the Bay of Bengal Initiative for Multi-Sectoral Technical and Economic Cooperation.

On 3 November 2015 the government appointed Masud Bin Momen as the next Ambassador and Permanent Representative of Bangladesh to the United Nations.

[6][5] The new Permanent Representative of Bangladesh to the United Nations, Masud Bin Momen, presented his credentials to UN Secretary-General Ban-ki Moon on 24 November 2015.