Infosys was founded in 1981 by seven engineers: N.R. Narayana Murthy, Nandan Nilekani, N.S. Raghavan, Kris Gopalakrishnan, S.D. Shibulal, K. Dinesh, and S. Gopalakrishnan (with Ashok Arora who left early). The question correctly lists four of the founders - Murthy, Nilekani, Raghavan, and Kris Gopalakrishnan.