Born in Empoli (FI) in March 1947, after obtaining his scientific high school diploma he graduated in Political Science at the University of Florence.
After some work experience in the IT sector, in 1973 he founded Sesa as a service and data processing company aimed at industrial and commercial companies in the Tuscan territory. In 1975, together with some of the main entrepreneurs in the IT sector, he established Anasin (National Association of IT Services, now Assinform) where he is still a member of the National Council.
In 1983 he started collaborating with IBM; Sesa becomes IBM Agency and in a few years the main IBM business partner for IT solutions for the SME segments. In 1994 he promoted the establishment of Computer Gross, a computer solutions distributor with headquarters in Empoli. The Company of which Paolo Castellacci has held the office of President from the beginning was born from the partnership between some of the most important IBM agencies including Sesa and in a short time, thanks to the distribution contracts of the main reference Vendors on the ICT market (IBM, Microsoft , HP, Oracle, Cisco) becomes the largest Italian value-added distributor of IT solutions.
He holds the position of Chairman of the Board of Directors of SeSa S.p.A., President of ITH S.p.A., holding company of the Sesa Group and President of the Sesa Foundation.
Sesa Group is leader in Italy in technological innovation sector and digital transformation services for the business segment, with consolidated revenues for over Eu 2 billion and 3,500 employees and a track record of continuous growth in revenues and employment in the last 10 years, boosted by use of external leverage of acquisitions (over 35 M&A since 2015).
He is married and father of two children.