Boudewijn van Milligen is a senior researcher at the National Fusion Laboratory, Spain. Before that, he conducted research at the RTP tokamak in The Netherlands, which included several stays at the JET Joint Undertaking in the UK and elsewhere. His main areas of interest are turbulence, transport and the interpretation of data from a wide variety of diagnostic systems. He has made a number of original contributions to these areas, using wavelets and techniques from the fields of chaos, statistics and self-similar and critical systems, leading to over 150 refereed publications in the framework of broad international collaborations. Raúl Sánchez is a full professor of Physics at the Universidad Carlos III de Madrid, Spain. Previously, he spent close to a decade at the Fusion Energy Division of the Oak Ridge National Laboratory (Tennessee, USA), first as a post-doctoral fellow (1998-99) and later as a senior staff scientist (2005-2011). During his research career, he has authored more than a hundred refereed publications in the fields of nuclear fusion, plasma physics, turbulence, computational physics and complex systems. He was the recipient of the Spanish “Miguel Catalán” Science Award in 2009 for scientists younger than forty. He was selected as a Fellow of the American Physical Society in 2017.