Guy Pujolle is a computer science professor at Université Pierre-et-Marie-Curie during 1981-1993 and from 2000 to the present day, a member of the Royal Physiographic Society in Lund, Sweden, and a distinguished visiting professor at UFRJ (University Federal of Rio de Janeiro) from 2013.

Before, he was a member of the Institut Universitaire de France from 2009 to 2014, a distinguished professor at the Division of IT Convergence Engineering of POSTECH, the Pohang University of Science and Technology, Korea, from 2011 to 2013.

He was appointed by the Education Ministry to fund the Department of Computer Science at the University of Versailles, where he spent the period 1994-2000 as Professor and Head.

He was Head of the CNRS MASI Laboratory, University Pierre-et-Marie-Curie, 1983–1993, Professor at ENST (École nationale supérieure des télécommunications), 1979–1981, and member of the scientific staff of INRIA (Institut National de la Recherche en Informatique et Automatique), 1974–1979.

He was chairman of the French Research Network REUNIR from 1987 to 1991, one out of the three members of the Wisdom Committee (Lars Backstrom, Brian Carpenter, Guy Pujolle) to decide on the future of TCP/IP in the European research network (decision January 22, 1990 to choose TCP/IP as the technology to be used for Europe instead of ATM).