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A Google search for "Luigi Warren" reveals that he is in fact a graduate student at Caltech.

http://woldlab.caltech.edu/bioinformatics/

This fits with the fact that he described himself as a biologist on FR.

He also apparently fancies himself as an actor:

He played Costard the Clown at a local theatre:

http://www.cyranojoe.com/LLL.html

Finally, it seems he is a "new age" character and has been into "life extension" for years:

http://www.alcor.org/cryonics/cryonics9012.txt

Strangely, for a graduate student he appears to be around his mid forties. I'm sure Caltech wouldn't apparove of his anonymous conspiracy theory website at http://hatfill.blogspot.com