My main research areas are Computational Linguistics and Natural Language Processing. I am interested in theoretical and application-oriented aspects of natural language semantics, and in cognitive aspects of language learning.

In my research, I want to help computers understand the meaning of words and utterances, and perform operations that we, humans, perform with language such as logical inference and translation. I want to help them recognize that one cannot run and sleep at the same time; that cats are pets but so can be iguanas (although less typical ones); that a great movie is one I would recommend to a friend, and this in different languages.

I am a Senior Research Investigator in the Department of Computer and Information Science (CIS) of the School of Engineering and Applied Science at the University of Pennsylvania, and member of the UPenn NLP group. I am currently on leave from the French CNRS where I hold a tenure researcher position. I am also associated with the NLP group of the Department of Informatics at the Athens University of Economics and Business.