The Tor Project is a Free Software project that helps defend
against traffic analysis.

It's a privacy tool that is utilized by everyone from human
rights activists to normal people seeking control over their
personal information. The best description is written here:
https://www.torproject.org/overview.html.en

FN: Give us an example of your work that you are proud of?

I am proud of helping to deploy the Tor Browser Bundle for
users: http://torbrowser.torproject.org/

I'm also proud of helping develop other parts of Tor and Tor
related utilities.

I am also proud of my role in starting the Cold Boot project:
http://citp.princeton.edu/memory/

And with my role (announced two weeks ago) in helping to
create the first rogue certificate authority:
http://www.win.tue.nl/hashclash/rogue-ca/