Leonardo Chiariglione was born in Almese (Italy). He obtained an MS-level degree in Electronic Engineering from the Polytechnic of Turin a Ph. D. degree from the University of Tokyo in 1973.

Since 1st of March 1971 he was with CSELT, the corporate research centre of the Telecom Italia group, where he was Vice President, Multimedia when he left the company on the 4th of July 2003.

Important milestones in his professional career were

RAM-based video simulator (1975)
DCT-based still picture transmission system (1979)
H.120 videoconference codec (1982)
H.120 multipoint videoconference unit (1985)
ITU-R Recommendations 601 and 656 interfaces (1986)
Basic-access ISDN videotelephone (1988)
MPEG-1 video-audio-systems codec (1991)
MPEG-2 video-audio-systems codec (1994)
DAVIC 1.0 system over ATM and IP (1996)
Platform for MPEG-4 services (1998).
He has led several European collaborative projects:

IVICO, a RACE project investigating cost-effective integrated video codecs
COMIS an ESPRIT project supporting the development of the MPEG-1 standard
EU 625 – VADIS a EUREKA project aiming at developing a European hardware and software technology for the MPEG-2 standard.
and participated in a number of other projects.