Professor of Computer Science at Vrije University in Amsterdam, Netherlands.
upload.wikimedia.org
See [ www.cs.vu.nl 
]
Author of several books:
Computer Networks, ISBN 0130661023; 2nd Edition: ISBN 013162959x
Operating Systems Design And Implementation, ISBN 0136386776
Modern Operating Systems, ISBN 0130313580
Structured Computer Organization, ISBN 0131485210
Distributed Systems Principles And Paradigms, ISBN 0130888931
Probably most famous for the interesting conversation he had around 1992 with Linus Torvalds on comp.os.minix about Linux and Minix...
Tanenbaum is also attributed as the author of this quote:
"The nice thing about standards is that you have so many to choose from; furthermore, if you do not like any of them, you can just wait for next year's model."
(Widely attributed to Tanenbaum, but also to Grace Hopper. Quote appeared in Andrew S. Tanenbaum, p168 "Computer Networks", 1st ed, 1981, and p254 of the second edition. The Unix Haters Handbook p10 attributes the first phrase of the quote to Grace Hopper.)
Andrew also operated [ www.electoral-vote.com ] during the 2004 US elections.
See original on c2.com