At IEG Aghassi has authored cluster evaluations of Vietnam and Ghana Development Policy Operations (DPOs), IEG's learning products on the quality of Development Policy Operation's results framework, and on the lessons from the use of policy based guarantees. He has been also working on improvements in IEG evaluation framework for DPOs.

His external publications in peer reviewed journals are in the areas of monetary and fiscal policies, poverty and income distribution, and industrial policy. 

Prior to joining IEG in 2012 he worked as an Economist in the Europe and Central Asia region. He holds graduate degrees in macroeconomics and development.