Esteban Domingo is a professor at the Spanish Research Council at Centro de Biología Molecular Severo Ochoa (Madrid) and President of the Spanish Society of Virology. He is a member of EMBO and Real Academía de Ciencias Exactas, Físicas y Naturales. Peter Schuster, em. professor of University of Vienna is a member of Leopoldina, Nationale Akademie der Wissenschaften, National Academy of Sciences USA, European Academy of Sciences and Arts and several other institutions. He worked together with Manfred Eigen and developed together with him the concepts of "quasispecies" and "hypercycles".