In 1984, he developed the Japan University UNIX Network (JUNET), and in 1988 established the WIDE Project (a Japanese Internet research consortium) of which he continues to serve as the General Chairperson. He is President of the Japan Network Information Center (JPNIC) and a member of ICANN's Board of Directors.

His Japanese publications include "Internet" and "Internet II" (Iwanami Shoten Publishing). He supervised the Japanese translation of the "Internet System Handbook" (Impress) and "IPv6: Next Generation Internet Protocol" (Prentice Hall) among countless others.

Profesor Murai received his Master's (1984) and Doctorate (1987) degrees in Computer Science from Keio University.