In 1974 and 1975 he was with Selenia S.p.A., working in the field of parallel computer architectures for signal processing.
From 1976 to 1981 he had a research position at the University di Pisa, Italy, working on combinatorial structures and magnetic bubble memories.
In 1980 he was visiting scientist at the IBM T. J. Watson research center (Yorktown Hgts., USA), working on algorithms for data transmission with SS/TDMA satellite systems.
From 1982 to 1987 he had a research position at the University "La Sapienza" of Rome, Italy, working mainly on VLSI architectures.
From 1987 to 1991 he was full professor at the University of l'Aquila, Italy.
From 1991 he is full professor at the University "La Sapienza" of Rome, Italy. From 1992 to 1994 he has been Head of the Computer Science Department. From 1995 to 1999 he has been Director of the Computer Science graduate program.