Wilfried Van Sark is a professor at the Copernicus Institute of Sustainable Development at Utrecht University. He received his PhD from Nijmegen University, the Netherlands, in III–V solar cell development, modeling, and processing in 1989. Then, he spent 7 years as a post-doc/senior researcher at Utrecht University and specialized in a-Si:H cell deposition and analysis. After an assistant professor position at Nijmegen University, where he worked on III–V solar cells, he returned to Utrecht University, with a focus on (single-molecule) confocal fluorescence microscopy of nano-crystals. In 2002, he moved to a position as assistant professor at the research group Science, Technology and Society of the Copernicus at Utrecht University. Between 2014 and 31 August 2018, he was an associate professor at the research group Energy & Resources of the Copernicus at Utrecht University. He was appointed as a Full Professor at the research group Energy & Resources of the Copernicus at Utrecht University in 2018. He is a recognized expert in performance analysis of photovoltaic modules and systems, and life cycle and market analysis.