Richard L. Epstein received his Ph.D. in mathematics at the University of California, Berkeley. He was a postdoctoral fellow in mathematics and philosophy at Victoria University of Wellington, New Zealand, a U.S. National Academy of Sciences Scholar to Poland, a Fulbright Fellow to Brazil, and a CNPQ Fellow to the University of Paraiba, Brazil. He is currently the Head of the Advanced Reasoning Forum. Walter A Carnielli received his Ph.D in logic and the foundations of mathematics at the State University of Campinas, Brazil. He has held a postdoctoral fellowship at the University of California, Berkeley, and an Alexander von Humboldt scholar to Universitat Bonn. From 1999 to 2017 he was Director of the Center for Logic, Epistemology, and the History of Science at the State University of Campinas, Brazil.