He has written about international events, Latin American politics, and crime. He is the former editor of ClarÃ­n, Argentina’s largest selling daily newspaper, and participated in the creation of ClarÃ­n’s online news operation. He is also the former editor of El Cronista Comercial, which he ran from 1975 to 1976. He was a visiting professor at the Graduate School of Journalism at University of California at Berkeley. He is a member of Argentina’s National Academy of Journalism. Guareschi is a two-time winner of the Konex Prize in Argentina. He studied literature at the University of Buenos Aires.