Contact Information:

Elemental Cognition
20 Westport Road
Wilton, CT 06897


I am a Researcher at Elemental Cognition, working on advancing the state of the art in intelligent systems through collaborative learning.

Before joining Elemental Cognition, I was a Research Staff Member and manager at the IBM T. J. Watson Research Center. The highlight of my career at IBM was as a key technical lead on the DeepQA project, focused on developing scalable and reusable Question Answering technology by developing and integrating state-of-the-art techniques in Natural Language Processing, Information Retrieval, Knowledge Representation and Reasoning, and Machine Learning. An initial application of DeepQA technology was in the development of Watson, a computer system that defeated Ken Jennings and Brad Rutter in a two-game Jeopardy! match in February 2011. Prior to joining IBM in 2001, I spent 5 years as a Member of Technical Staff at Lucent Technologies Bell Laboratories. My research interests include question answering, semantic search, natural language discourse processing, and spoken dialogue management.

I am currently serving on the editorial boards of the Journal of Dialogue Systems and the ACM Transactions of Intelligent Systems. In the recent past, I was General Chair for NAACL HLT 2012, and served as program committee area chairs for EMNLP 2017, EMNLP 2014 and ACL 2013. In the more distant past, I was program co-chair of HLT/NAACL 2006, and served on the executive board of the North American Chapter of the ACL in 2007 and 2008, on the editorial board of the Computational Linguistics Journal, and as secretary and scientific advisory board member of the ACL/ISCA special interest group on discourse and dialogue (SIGDIAL).