He's a professor of mathematics at Harvard. To quote him:
The Bible Code by Michael Drosnin exploits a hoax
perpetrated by two Israelis, E. Rips and D. Witztum,
which purports that there are messages about the
future encrypted in the Hebrew text of the Bible—
codes which can only be deciphered by computer.
It is easy to give a concise explanation of why this
is a hoax, and so I shall do so here. ...