Hussen is a climate modelling expert at the IGAD Climate Prediction and Applications Centre (ICPAC). His area of research includes climate forecasting, climate modelling, regional climate analysis, downscaling, and uncertainty analysis. He is particularly interested in downscaling regional climate forecasts and longer-term projections to national, sub-national and local levels to improve weather and climate products. He is also interested in building the capacity of young regional climate scientists in climate modelling and prediction, downscaling and interpreting climate information, as well as communicating uncertainty. He is specialised in processing and analysing large climate model outputs (S2S forecast, CORDEX and CMIP5/6).