Our department's Mariusz Urbański is among the top 2% of the most-cited mathematicians, according to a study by a group of scientists led by John P.A. Ioannidis, a statistician at Stanford University. The study was published in the Public Library of Science Biology journal: "Updated science-wide author databases of standardized citation indicators." Mariusz's research interests are extensive and include fields such as dynamical systems, ergodic theory, fractal geometry, conformal dynamical systems, holomorphic dynamical systems, open dynamical systems, iteration of transcendental meromorphic functions, iterated function systems, thermodynamic formalism, gas lattices, statistical physics, potential theory (harmonic measure), number theory, Kleinian groups, and topology (topological dimension). His list of publications includes 3 books and totals more than 200 publications. He has worked with more than 30 collaborators and according to AMS MathScinet "Mariusz Urbański is cited 2984 times by 926 authors in the MR Citation Database".