2002 - 2007
Numerical algorithms for scalably computing a customized ranking of the web for every search user.
2005 - present
Data mining, information extraction, and data visualization systems for search and sentiment analysis on the social web.
2007 - present
Models in information retrieval that seek to find people, rather than documents, to answer a user's information need.
2003 - 2005
Algorithms, social mechanisms, and peer-level protocols for information retrieval and management in distributed networks.
2001 - 2003
Probabilistic models for text mining and document clustering, and their implications towards search algorithms.