Dennis has worked in user research since 1981. He was a usability manager at Digital Equipment Corporation, where methods such as Usability Engineering, Contextual Inquiry, and data logging were developed. For the past 12 years Dennis has managed research teams at Microsoft, which have covered a wide spectrum of products. Notably he managed the Games User Research team, which developed RITE (Rapid Iterative Testing and Evaluation) and TRUE (Tracking Real-time User Experience) methods. TRUE was very successfully applied the Halo franchise.
Dennis also has been an active member of the CHI community for many years, serving as in a number of roles including Conference Co-chair. He has co-authored over 50 articles, book chapters and talks on HCI. He is coauthor of two books Field Methods Casebook for Software Design (with Judy Ramey) and Brave NUI World (with Daniel Wigdor).
He is adjunct full professor at University of Washington in the department of Human Centered Design and Engineering Design. Dennis holds a PhD. in experimental social psychology from Clark University.