Marcelo Viana is Professor of Mathematics at the Instituto Nacional de Matematica Pura e Aplicada (IMPA), Rio de Janeiro, and a leading research expert in ergodic theory and dynamical systems. He has served in several academic organizations, such as the International Mathematical Union (Vice President, 2011 2014), the Brazilian Mathematical Society (President, 2013 2015), the Latin American Mathematical Union (Scientific Coordinator, 2001 2008) and the newly founded Mathematical Council of the Americas. He is also a member of the academies of science of Brazil, Portugal, Chile and the Developi...