Matti Leppäranta is an emeritus professor of geophysics at the University of Helsinki. He has decades of experience in the study of sea ice, lake ice, and snow physics. His research has advanced understanding in ice dynamics, thermodynamics, and climate interactions. He has held research and teaching positions worldwide, including at Hokkaido University and the Chinese Academy of Sciences and lectured regularly at UNIS, Svalbard. A prolific author, he has published several books with Springer, such as The Drift of Sea Ice and Freezing of Lakes and the Evolution of Their Ice Cover.Petteri Uotila is a professor of geophysics at the University of Helsinki, specializing in polar oceanography. His research focuses on the polar oceans and their role in the climate system, with contributions to ocean modeling. He has held research positions at leading institutions including Monash University, CSIRO, and the Courant Institute at NYU. In addition to publishing extensively, he has authored book chapters on sea ice modeling and ocean–climate linkages.