Didier Vuarnoz was born in 1977. His first position was an apprenticeship in the engineering office of Bonnard & Gardel SA in Lausanne. After completion, he worked as a heating designer for the same company. During this period, he participated in the retrofit of the former nuclear power plant of Lucens, and at the main office of the Swiss Center for Electronics and Micro-technology (CSEM) in Neuchatel. Then, he studied at the University of Applied Sciences of Western Switzerland (HEIG-VD), where he obtained his diploma in thermal engineering in 1999, with a prize from the Sulzer company. After further employment and as a result of his work on the visualization of ice slurry and its storage for the experimental group (Thermal Industrial Systems, TIS) of the Institute for Thermal Sciences (IGT) at the HEIG-VD, he received a fellowship from the Academy of Engineering Sciences of Switzerland (SATW) to continue his research in Japan. During his stay at Hokkaido University (2002-2003) and Okayama University (2003), he conducted experimental work with an ultrasonic velocity profiler (UVP) on phase change slurries (PCS). At that time, Vuarnoz also became an active member of the Working Party of the International Institute of Refrigeration (IIR) on Phase Change Slurries. After this first stay in Asia, he returned to his former university in Switzerland (HEIG-VD), where he was given responsibility for the experimental PCS research group in physical properties and thermodynamic and fluid dynamic behaviour. The main achievements of the group were published in the Handbook of Ice-slurries edited by the IIR (2005). In 2007, Vuarnoz joined the division of Prof. Egolf named Simulations of Thermal Systems, SIT. He entered the field of magnetocalorics, focusing on numerical computations of refrigeration, heat pumping and magnetic energy conversion systems. Furthermore, he became an active member of the Working Party on Magnetic Refrigeration (at Room Temperature) of the IIR. In 2008, he visited Prof. Alan Hatton's research group for several months at MIT in the US. In 2009, he was chosen by the Japanese Ministry of Education for a grant supporting a PhD at a Japanese university. Under the supervision of Prof. T. Kawanami at Kobe University, he investigated both experimentally and by simulation active magnetic regenerators for three and a half years, before graduating in Spring 2013 with his thesis entitled Reflections and Evaluations of the Performances in Magnetocaloric Systems. At this time, the implementation of his work on magnetocaloric energy conversion machines was judged by a report edited by the Swiss Federal Office of Energy (Helbin and Bill, 2014) to have & for Germany alone & a market potential of 1.6 billion CHF and an annual carbon mitigation of 1.3 million tons of C02 eq. In 2013, Vuarnoz came back to Switzerland, again to rejoin the group of Prof. Egolf (HEIG-VD) for a commitment in thermo-magnetism. The following two years were dedicated to a novel treatment for cancer (hyperthermia) within a national inter-institutional research team. This innovative method relies on rotating nanowires inducing local hyperthermia. Since 2015, Vuarnoz has been working as a senior scientist for the Swiss Federal Institute of Technology (EPFL) on energy strategies and carbon emission mitigation in buildings. Vuarnoz has co-signed to two patents and authored 16 journal papers and 48 conference papers. With a group of researchers, he has also proposed five new dimensionless numbers to the scientific community. Furthermore, he is a regular reviewer for several journals, including International Journal of Refrigeration, Energy Conversion and Management, Applied Energy, and International Journal of Heat and Mass Transfer. He has also served several times as a chairman at international conferences, such as Thermag II, ICR 2011, and TFEC 2012.