As a prospective MS/PhD student: If you are applying to UT, you should apply to the appropriate Computer Science degree program at UT through the standard channels.
As an MS/PhD student already at UT: Please email Greg directly.
As an undergraduate at UT: If you are interested in joining the lab, please email Greg directly. In your email, you should (1) attach a resume; (2) briefly describe any particularly relevant prior experience. Please note that at this time, only current UT students will be considered for RA positions.