Litter is Doctor in Chemistry from the Buenos Aires University, Argentina (1974) with Postdoctoral stage at the University of Arizona, USA (1983). She is Senior Researcher of the National Research Council (CONICET) and Full Professor at the University of General San Martín, Argentina. She was Principal Researcher and Head of the Environmental Chemistry Remediation Division at the National Atomic Commission. Main research interests: treatment of organic and inorganic contaminants in water and air by innovative advanced technologies, especially heterogeneous photocatalysis and use of iron nanomaterials. She authored more than 250 scientific publications in international journals, books and chapters of books. She received the Mercosur Prize twice in 2006 and 2011. She was President of the Organizing Committee of the 5th International Congress on Arsenic in the Environment in Buenos Aires, Argentina, 2014. She was designated pioneer on photocatalysis in Argentina (2016). She received the Eduardo Charreau Prize 2021 Edition

Ugarte (PhD, 1990, Université Paris-Sud) is professor, Instituto de Física Gleb Wataghin, Campinas, Brazil. His activities have been related to the experimental study of structural and electronic properties of nanoscale systems (nanoparticles, nanotubes, nanowires, etc.), using high spatial resolution techniques associated with electron microscopy. He designed and implemented the Brazilian Electron Microscopy Facility, which was opened in 1999; this microscopy lab was the seed to the subsequent creation of the Brazilian National Nanotechnology Lab in 2011. His prizes include Latsis Prize, École Polytechnique Fédérale de Lausanne, Switzerland; Guggenheim Fellowship, USA; Scopus Prize, Brazil; TWAS Prize in Physics. His is a member of the Brazilian science academy.