Dr. Rajabu is an expert in the fields of renewable energy and power systems. He is currently a Senior Lecturer at the University of Dar es Salaam teaching undergraduate and postgraduate students in energy systems and power engineering related subjects. Apart from teaching, Dr. Rajabu has 25 years of experience in research and consultancy in the areas of biofuels, renewable energy, energy conservation and management, technical assessment and valuation of machinery and power units, environment and socio assessment of energy and power projects, air pollution, household energy survey, improved cookstoves and fuels, field and lab stoves testing, and engine performance testing.