Lassi Roininen is Professor of Applied Mathematics in Lappeenranta, a position he has held since September 2022, before which he was Associate Professor of Applied Mathematics at Lappeenranta from 2018-2022. Roininen holds MSc in mathematics from Tampere University of Technology. He completed his PhD in applied mathematics at the University of Oulu in 2015. The work was carried out at the Sodankylä Geophysical Observatory, an independent research department of the University of Oulu. After that, he was a postdoctoral researcher in the Department of Mathematics at Tallinn University of Technology, the Department of Statistics at the University of Warwick, the Department of Mathematics at Imperial College London, and then an Academy of Finland postdoctoral researcher at the University of Oulu. Roininen is also a Docent of applied mathematics at the University of Oulu, Adjunct Associate Professor at Bahir Dar University (Ethiopia) and affiliated AIMS (African Institute for Mathematical Sciences, Rwanda) Faculty member.