Computational linguistics involves anything that combines computers and human language. Most familiar is probably language technology, such as machine translation, speech recognition, and information extraction. But computational linguistics also includes computational models of language processing and language learning, grammar engineering, and the management and analysis of large linguistic corpora, including the documentation of endangered languages.
Steven Abney specializes in computational linguistics, particularly parsing and language learning. Ezra Keshet has interests in computational semantics. Jonathan Brennan is interested in how semantic representations are constructed in real time. Drago Radev (School of Information and Linguistics) specializes in computational linguistics in information systems, especially summarization and question answering. Richmond Thomason (Philosophy and Linguistics) has interests in natural language generation and dialogue systems. Richard Lewis (Psychology and Linguistics) studies computational models of human sentence processing.