He graduated as aeronautical engineer from Industry Training Authority, first in the class of 1952, having completed a Masters (1961) and Doctor of Philosophy (1971) at University of California, Berkeley.
He was a student of David A. Huffman among others at Berkeley. Pacitti wrote several books in computer science, especially the Fortran Monitor, which from 1967 to 1987 has sold 250,000 copies in the country, and Do Fortran à Internet (From Fortran to the Internet), retrospect of his life and information technology in the world, already in its third edition He launched in 2006 Paradigmas do software aberto (Paradigms of open source software), his most recent work.
He led the introduction of information technology at the Industry Training Authority, at the Air Force, at COPPE-Federal University of Rio de Janeiro and at UNIRIO. He was rector of the Industry Training Authority between 1982 to 1984, and established the course of Computer Engineering.
His last post in the Air Force Command, as Major-Brigadier Engineer, was the Head of the Directorate of Engineering in 1986 and 1987 season in which he also chaired the ADESG. He was president of the Council of Informatics of the State of Rio de Janeiro from 1987 to 1990. lieutenant currently belongs to the National Academy of Engineering and is scientific adviser to the presidency of Consist.