Prof. Pei Liu is a professor at the Department of Energy and Power Engineering of Tsinghua University. He received his PhD in Process Systems Engineering from Imperial College London. His research interest is in energy systems engineering, where he uses methodologies of process systems engineering to model, simulate, and optimize the design and operation of complex energy systems. He has developed a series of methods and tools for optimal design of polygeneration energy systems, distributed energy systems, energy systems in buildings, hydrogen infrastructure planning, optimal design of pipelines network for carbon dioxide transport at supercritical state, power sector planning with constraints of carbon dioxide emissions, and coal supply chain planning with constraints of water resources. He has authored/co-authored more than 100 papers in international peer-reviewed journals and conferences with more than 4000 citations, co-authored three books on energy systems engineering, and more than ten book chapter contributions. He is a subject editor of the journal of Chemical Engineering Research and Design and an editorial board member of the journals of Computers and Chemical Engineering, Processes, Frontiers in Chemical Engineering, and others. He leads projects funded by the National Science Foundation of China, the Ministry of Science and Technology, the European Commission, Energy Foundation, and several projects from the industry, including BP, Siemens, and Toyota.