Stanisław Stupkiewicz is a professor at the Institute of Fundamental Technological Research (IPPT), Polish Academy of Science in Warsaw, Poland and head of the Materials Modelling Group. He graduated from the Warsaw University of Technology in mechanical engineering (1989) and received his PhD (1996) and habilitation (2006) at IPPT. Since 2011 he is a full professor. In 2013, he spent one year in Italy as a visiting professor at the University of Trento.
His research interests include micromechanics of interfaces and interface layers, size effects, multiscale modelling of shape memory alloys, phase-field modelling of microstructure evolution, constitutive modelling of contact phenomena, contact mechanics, plasticity, crystal plasticity, and computational mechanics.
Since 2020 he is a corresponding member of the Polish Academy of Science. He also serves as chairman of the Committee on Mechanics of the Polish Academy of Science. He is as an Associate Editor of Mechanics of Materials, Section Editor of Archives of Mechanics, and member of the editorial board of Archive of Applied Mechanics.

Formation and evolution of microstructures, strain localization and propagating instabilities, all leading to highly inhomogeneous deformation, are characteristic features of displacive transformations, such as martensitic phase transformation and deformation twinning. These phenomena are accompanied by nucleation, propagation and annihilation of interfaces, which makes their modelling challenging. At the same time, understanding of these phenomena is crucial for development and optimization of numerous advanced materials. Spatially-resolved modelling of the corresponding phenomena can be efficiently carried out using the diffuse-interface approach. To illustrate the approach, recent results (both published and unpublished) are discussed, including phase-field modelling of martensitic phase transformation and deformation twinning at the micro-scale and phenomenological modelling of propagating instabilities in shape memory alloy (SMA) polycrystals at the macroscale.