Scientist Emeritus at NASA/Goddard Space Flight Center in Greenbelt, Maryland, USA

Rosario Physics Institute (National Research Council, CONICET-UNR); National University of Rosario (UNR), Argentina

Department of Astronomy, The Ohio State University, USA, Chemical Physics Program, The Ohio State University, USA

Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY, USA

Department of Astronomy, The Ohio State University, Columbus, USA