Celis graduated in 1979 with a bachelor's degree in Computer Engineering from the Monterrey Institute of Technology and Higher Studies (ITESM) and received both a master's degree in Mathematics (1982) and a doctorate in Computer Science (1986) from the University of Waterloo.
San Pedro Sula | San Pedro | Pedro Almodóvar | San Pedro de Macorís | Pedro Infante | Pedro II of Brazil | Pedro Martínez | Pedro Vargas | San Pedro, Los Angeles | Pedro Rosselló | San Pedro Town | Colégio Pedro II | Pedro Rodríguez | Pedro Fernández de Castro | Pedro Damián | Pedro Álvares Cabral | San Pedro de Atacama | Point Pedro | Pedro Juan Caballero, Paraguay | Pedro Juan Caballero | Pedro Cieza de León | Pedro Bell | Dom Pedro | Colégio Pedro II (Rio de Janeiro) | São Pedro | Pedro Torres | Pedro Rodríguez (racing driver) | Pedro Rizzo | Pedro Pierluisi | Pedro Paterno |