And Doctor of Philosophy degree from Dhaka University"s history department.
He earned his Master of Arts
In 2012, Mamoon appeared as a prosecution witness at International Crimes Tribunal-1 which was engaged by the Bangladesh Government to try the war criminals of 1971. Winning the lawsuit against General Safiullah on High Court"s verdict to maintain the historic locations at Sarwardy Uddyan and all over Bangladesh.He is the vice president of Ekatturer Ghatak Dalal Nirmul Committee, advocacy group for the trial of War Criminals of Bangladesh Liberation War. In 1980s and 1990s, Mamoon wrote and translated some thrillers, horror stories and science fiction stories.
In his witness"s account, Mamoon said that members of the Peace Committee used to advise Pakistani military leaders about where and how to strike the freedom fighters of Bangladesh.