Mathai Joseph was one of the early computer scientists at the Tata Institute of Fundamental Research in Mumbai, where he worked from 1968–85, interspersed with research periods spent in France, the UK and the US. From 1985-97 he had a chair in computer science at the University of Warwick in the UK, following which he returned to India and became head of research at Tata Consultancy Services.
He has written, edited and published several technical books and numerous papers, as well as newspaper articles and columns, and given talks at universities in many different countries. He was elected to the Council of the Association for Computing Machinery for 2008-12 and received the ACM Presidential Award in 2010.
He is married and has a son and daughter. He and his wife Anita now live in Pune, India.