He is also a Visiting Professor at the Hong Kong Polytechnic School of Design. His primary area of scholarship, and the one for which he is best known, is sustainable interaction design. This area of scholarship and his core expertise are situated within the confluence of human-computer interaction as it owes to the computing and cognitive and ethnographic sciences, and design as it owes to the reflection of design criticism and the practice of critical design. His scholarship also engages design theory, digital imagery and visual thinking, and design learning.