Mgr. Petr Holub studied physics at the Faculty of Science and environmental studies at the Faculty of Social Studies of Masaryk University. He founded the consultancy company Budovy21 and was the director of Chance for Buildings, a professional association for energy-efficient construction. He previously worked at the Ministry of the Environment as an advisor to ministers and director of the Sustainable Energy and Transport Department. He also spent a number of years leading sustainable energy programs in the Rainbow Movement and helping cities to join the Compact of Mayors in SEVEn. As an advisor to the European Commission, he proposed setting up a framework for energy savings in Ukraine. He enjoys traveling and hiking.