I lead the Interaction Lab in the school of Mathematical and Computer Sciences (MACS) at Heriot-Watt University, Edinburgh. I was a Senior Research Fellow in the School of Informatics, Edinburgh University, UK (2003-2009). Before that, I worked at Stanford University, California (2000-2002). I work on machine learning methods for intelligent and adaptive multimodal interfaces, including Speech Recognition, Spoken Language Understanding, Natural Language Generation, and human-computer interaction in virtual environments.