Partha is a member of the Display Advertising Sciences Group and is currently contributing mainly to projects in contextual advertising. He is exploring semantic analysis of publisher pages and advertisements, and models of user intent determined by collaborative filtering methods, for selecting advertisements which are likely to be of interest to a user visiting a publisher page. Prior to joining Yahoo in 2007, Partha was a Principal Member of Technical Staff at AT&T Labs where he conducted research in the area of Speech and Speaker Recognition.