Current Professional Activities

• Executive board member, North American Chapter of the Association for Computational Linguistics (NAACL), 2007-2008.
• Editorial board member, Journal of Dialogue Systems, 2006-present
• Guest editorial board member, Journal of Natural Language Engineering special issue on Interactive Question Answering.
• Program committee member, ACM Conference on Research and Development in Information Retrieval (SIGIR), 2007.
• Program committee member, Annual Meeting of the Association for Computational Linguistics (ACL), 2007.
• Program committee member, ACL SIGLEX 4th International Workshop on Semantic Evaluations (SemEval) Web People Search task, 2007.
• Program committee member, Dynamic Searches and Knowledge Building Workshop at the UCLA Institute for Pure and Applied Mathematics program on Mathematics of Knowledge and Search Engines, 2007.

Select Past Activities

• Program co-chair, Human Language Technology Conference/North American chapter of the Association for Computational Linguistics annual meeting (HLT/NAACL), 2006.
• Program committee area chair, Human Language Technology Conference/ Conference on Empirical Methods in Natural Language Processing (HLT/EMNLP), 2005.
• Editorial board member, Computational Linguistics journal, 2000-2002.
• Program committee area chair, Annual Meeting of the Association for Computational Linguistics, 2001.
• Tutotials chair, North American chapter of the Association for Computational Linguistics annual meeting/Applied Natural Language Processing Conference (NAACL/ANLP), 2000.
• Secretary, ACL/ISCA special interest group on discourse and dialogue (SIGDIAL), 2002-2003.
• Scientific advisory committee, ACL/ISCA special interest group on discourse and dialogue (SIGDIAL), 1997-2001.