Prof. Mamun, for his pioneering contribution in dusty plasma physics, was awarded a number of very prestigious post-doctoral fellowship (by international open competition), e. g. Alexander von Humboldt (AvH) Post-Doctoral Research Fellowship by the AvH Foundation (Germany), Commonwealth Post-doctoral Research Fellowship by the Commonwealth Scholarship Commission (UK), the Max Planck Research Fellowship by the Max Plank Institute (Germany), etc. to carry out the advanced research in dusty plasma physics in Germany, UK, etc. He has also been appointed a Regular Associate of the International Centre for Theoretical Physics (ICTP), Trieste, Italy to update his scientific knowledge by making scientific visits to the ICTP time to time.