For those interested but did not want to do the research, the student in question is Chris Klaus who donated $15 million in 1999 in order to get Georgia Tech's new (at the time) computing building named after him[1]. He founded Internet Security Systems right after graduating which IBM acquired for approximately $1.3 billion in 2006[2]. It is also interesting to note that the gift was made after his company went public in 1998[3].
[1] http://www.philanthropy.gatech.edu/building/christopher-w-kl...
[2] https://www-03.ibm.com/press/us/en/pressrelease/20164.wss
[3] http://www.nasdaq.com/markets/ipos/company/internet-security...