**Ryszard Kutner**

Ryszard Kutner has been working at the Faculty of Physics University of Warsaw, for over fifty years, although he retired for ten years. He has been studying complex systems, especially econophysics, using nonlinear statistical physics methods (see the List of Publications at: https:// sciprofiles.com/profile/934121). He is particularly interested in non-equilibrium phase transitions, particularly in critical phenomena in various markets (e.g., financial or company markets). He and his colleagues are Editors of three Topical/Special Issues:

(i) The Continuous Time Random Walk Still Trendy: Fifty-year History, Current State, and Outlook https://link.springer.com/journal/10051/topicalCollection/AC 94c92ef44597467b3e0fc68759b076f1 (ii) Econophysics and sociophysics in turbulent world https://www.sciencedirect.com/journal/ physica-a-statistical-mechanics-and-its-applications/special-issue/10ZXGBDQBD0

(iii) Three Risky Decades: A Time for Econophysics? https://www.mdpi.com/journal/entropy/ special issues/entropy econophysics and several conference proceedings on econophysics, e.g., 2020 vol. 138(1) and 2018 vol. 133(6)

http://przyrbwn.icm.edu.pl/APP/apphome.html or2005vol.36(8)https://www.actaphys.uj.edu.pl/
