Contact

email: zzilm.xozfhvg@xlolizwl.vwf (decode this Atbash cipher) 
office: ECES 118B 
phone: +1 303 492 6643
fax: +1 303 492 2844

Regular postal mail can be sent to:
Aaron Clauset
University of Colorado Boulder
Department of Computer Science
430 UCB
Boulder, CO 80309-0430 USA