IIRC, I think that case was about a lot more than just his contrarian 9/11 views, although I suppose they were instrumental in shining a spotlight on him bright enough to reveal all the other ways in which he was a fraud.

ETA: Okay, found his name: Ward Churchill. Intro matches my summary:

In January 2005, Churchill's work attracted publicity, with the widespread circulation of a 2001 essay, On the Justice of Roosting Chickens. In the essay, he claimed that the September 11, 2001 attacks were provoked by U.S. policy, and referred to the "technocratic corps" working in the World Trade Center as "little Eichmanns".

In March 2005 the University of Colorado began investigating allegations that Churchill had engaged in research misconduct; it reported in June 2006 that he had done so. Churchill was fired on July 24, 2007, leading to a claim from some scholars that he was fired over the ideas he expressed.

So he was officially fired for research misconduct, but that misconduct would probably have gone unnoticed if not for his look-at-me-I'm-a-contrarian spiel.

Note: If you have a cushy job predicated on fraudulent work you've done in the past, and ethics don't trouble you, try to keep a low profile, moron.