I am currently managing several research groups focusing on ranking, query & document understanding, and multi-modal / multi-lingual models.

I am broadly interested in practical applications of information retrieval, natural language processing and statistical machine learning.

Specifically, I worked on research problems in a variety of domains, including web, email & enterprise search, recommendation systems, document clustering, web crawling, passage retrieval, query log mining, information extraction, plagiarism detection and computational advertising.