Luc Montagnier is a French virologist and Nobel Prize co-winner for his joint discovery of the Human Immunodeficiency Virus. He is the co-founder of the World Foundation for AIDS Research and Prevention and co-director of the Program for International Viral Collaboration.
 Where things go south
In 2009, he conducted an "experiment" on diluted DNA in which he purported the DNA emitted an electromagnetic signal after it had been diluted down to nothing.
He used his laptop and a cheap amp to do the experiment, so it's 99.9% certain that he just picked up some white noise.
Nevertheless, woo-meisters like Deepak Chopra and Dana Ullman have held this up as vindication of homeopathic "theories", especially since Montagnier has become something of an outspoken apologist for homeopathy after he conducted this "experiment". If a Nobel-winner says it, it must be true!
The fact that the effect lasts a few picoseconds, has not been reproduced by other scientists, was self-published without peer-review, and according to Montagnier himself the research "cannot extrapolate it to the products used in homeopathy".
Apparently, his homeopathic infallibility does not extend to knowing the applicability of his own research.
 See also
- Bio at Nobelprize.org
- It almost makes me disbelieve HIV causes AIDS! PZ Myers
- Luc Montagnier: The Nobel disease strikes again, Respectful Insolence
- The Nobel disease and me, David Gorski, Science Based Medicine