A unifying theme is the development of data-driven models and algorithms for assigning syntactic and semantic representations to sentences of natural language.

Syntactic and semantic parsing
Lexical and phrasal semantics
Application areas
Additional topics that my PhD students and RAs have worked on include Chinese syntactic processing (ACL 2007, ACL 2008, EMNLP 2010, CL 2011), dependency parsing (EMNLP 2008), syntax- and RNN-based generation (EMNLP 2011, EACL 2012, CL 2015, EACL 2017), large-scale semantic network construction (AAAI 2007), timeline extraction and user-centered approaches to information retrieval.