VA Shiva Ayyadurai (Tamilan:சிவா அய்யாதுரை) (born 2 December 1963 in Bombay, India) is an Indian American scientist, inventor and entrepreneur.
As a high school student in 1978, he developed a full-scale emulation of the interoffice mail system, which he called "EMAIL" and copyrighted in 1982. That name's resemblance to the generic term "email" and the claims he later made for the program have led to controversy over Ayyadurai's place in the history of computer technology.
Ayyadurai teaches Systems Visualization at MIT. In 2012, he launched Systems Healthguru and perhaps the most famous of America's alternative medicine practitioners.
VA Shiva Ayyadurai is the founder of the email service company EchoMail, Inc. EchoMail's core technology originated from VA Shiva Ayyadurai's invention for classifying inbound email for the U.S. White House, which was seeking a reliable encryption and classification system for President Clinton's email.