I have been a graduate student at UC San Diego since the fall of 2009. I work with Geoff Voelker and Stefan Savage. My current research is to learn how people use DNS by inferring the intent of domain name registrants, and I'm very interested in how new TLDs impact registrations. I have previously investigated email spam from a monetary perspective by measuring many email spammers' costs and revenue. I intend to graduate with a PhD in the summer of 2015.

I received my Bachelor of Science degree from the University of Wisconsin in the spring of 2009, where I studied Computer Science. My undergraduate research advisor was Paul Barford. We did work relating to both botnets and network measurement during my last two years there. I also spent a lot of time in the Undergraduate Projects Lab while I was there.

From .academy to .zone: An Analysis of the New TLD Land Rush, Tristan Halvorson, Matthew F. Der, Ian Foster, Stefan Savage, Lawrence K. Saul, and Geoffrey M. Voelker, Proceedings of the ACM Internet Measurement Conference (IMC), Tokyo, Japan, October 2015.

XXXtortion? Inferring Registration Intent in the .XXX TLD, Tristan Halvorson, Kirill Levchenko, Stefan Savage, and Geoffrey M. Voelker, Proceedings of the International World Wide Web Conference (WWW), Seoul, Korea, April 2014.

The BIZ Top-Level Domain: Ten Years Later, Tristan Halvorson, Janos Szurdi, Gregor Maier, Mark Felegyhazi, Christian Kreibich, Nicholas Weaver, Kirill Levchenko, and Vern Paxson, Proceedings of the Passive and Active Measurement Workshop, Vienna, Austria, March 2012.

Show Me the Money: Characterizing Spam-advertised Revenue, Chris Kanich, Nicholas Weaver, Damon McCoy, Tristan Halvorson, Christian Kreibich, Kirill Levchenko, Vern Paxson, Geoffrey M. Voelker, and Stefan Savage, Proceedings of the USENIX Security Symposium, San Francisco, CA, August 2011.

Click Trajectories: End-to-End Analysis of the Spam Value Chain, Kirill Levchenko, Neha Chachra, Brandon Enright, Mark Felegyhazi, Chris Grier, Tristan Halvorson, Chris Kanich, Christian Kreibich, He Liu, Damon McCoy, Andreas Pitsillidis, Nicholas Weaver, Vern Paxson, Geoffrey M. Voelker, and Stefan Savage, Proceedings of the IEEE Symposium and Security and Privacy, Oakland, CA, May 2011.