Mr. Grujic has a PhD and an ME from the Faculty of Mining and Geology. He is Scientific Associate at the Ministry of Education, Science and Technological Development. Mr. Grujic worked as senior associate for the energy administration of the city of Belgrade from 2002 to 2014, where he got involved in the development of the city’s energy strategy. Since 2014 Mr. Grujic works in the secretariat for environmental protection as head of the climate change, energy efficiency and renewable energy sources department. Mr. Grujic is the focal point in the city of Belgrade for UN Environment’s District Energy in Cities Initiative and the Building Efficiency Accelerator. Mr. Grujic has published numerous research articles on sustainable energy and environmental protection.