Assistant Professor, Computer Science
Affiliate Assistant Professor, iSchool
University of Maryland, College Park
3173 AV Williams
Department of Computer Science
University of Maryland
College Park, MD 20742
2117F Hornbake Library, South
Human-Computer Interaction Lab
University of Maryland
College Park, MD 20742
My PhD Students
My MS Students
I am an Assistant Professor in the Department of Computer Science
at the University of Maryland, College Park
with an affiliate appointment in the College of Information Studies
I am also a member of the Human-Computer Interaction Laboratory (HCIL),
the Institute for Advanced Computer Studies (UMIACS)
the founder of the new HCIL Hackerspace
HCIL research lablet: the Makeability Lab. Research in the Makeability Lab is funded, in part,
by a Google Faculty Research Award, a 3M Faculty Award, Nokia, the NSF, and the
Department of Defense's Clinical and Rehabilitative Medicine Research Program.
I received my Phd in Computer Science from the University of Washington in December 2011 where I was a
Microsoft Research Graduate Fellow
and the 2010 College of Engineering "Graduate Innovator of the Year."
My PhD dissertation entitled "Sensing and Feedback of Everyday Activities to Promote Environmental Behaviors"
won numerous awards including the 2012 University of Washington Distinguished Dissertation Award and an
honorable mention for the national 2012 Council of Graduate Schools Distinguished Dissertation Award in Mathematics, Physical Sciences, and Engineering.
At UW, I was co-advised by James Landay
and Shwetak Patel
I also have an MS in Information and Computer Science from the University of California, Irvine where I was advised by Paul Dourish
During my graduate studies, I was fortunate to intern at a
number of great research labs including Telefonica Research
and Intel Research
My work has been published in over 35 scientific peer-reviewed publications in many top venues including ACM CHI, UbiComp, IJCAI, MobiSys, ASSETS, and ICSE
garnering three best paper awards (CHI'10, CHI'13, ASSETS'13) and five best paper honorable mentions (UbiComp'09, CHI'12, CHI'13, 2 x CHI'15). Please see my publication page
Google Scholar page
for more details.
My teaching largely mirrors my research intersts: I teach a physical making class called Tangible Interactive Computing
(e.g., Spring 2014
as well as an intro class on HCI (e.g.,
). My teaching statement is available here
More about teaching here
My research focuses on designing, building, and evaluating interactive technology that addresses high
value social issues such as environmental sustainability, computer accessibility, and personalized
health and wellness. This work often involves the entire spectrum of information flow: from sensing
physical events, to intelligently interpreting/classifying this data, to building visualizations that
inform and motivate behavior. Please see my list of publications here
My research interests can broadly be broken down into four areas:
research focus diagram inspired by professor bjoern hartmann
There is often a profound disconnect between our everyday behaviors and the effects those behaviors
have on our health and the environment around us. In this research, I explore how technology can be
used to effectively sense and report information about environmental behaviors to promote awareness
and enable positive behavior change. Research questions involved here include: What behaviors
should we sense and how? How, where, and when should this sensed activity data be presented? And, finally,
What impact can sensing and feedback have on behavior?
City-wide urban infrastructures are increasingly reliant on network technology to improve and expand
their services. As a consequence, our interactions in the physical world are increasingly leaving
behind digital footprints. In this research, I explore how these digital footprints can reveal otherwise
latent patterns of human behavior as well as implications for the improvement of city infrastructures
themselves (e.g., shared bicycling programs, rail and bus systems).
As sensors continue to decrease in size/price and advances in machine learning enable better and more
granular activity recognition, there is an enormous opportunity for sensing and feedback applications
for personal health particularly around sleeping, diet, and exercise. In the long term, I hope to
continue building and studying applications that motivate positive behaviors for both health and the
environment. Significant questions remain: What are the most effective strategies for motivating behaviors?
Can systems adapt their strategies to fit the individual user? How can we use technology to sustain behaviors
over time? What is the role of augmented reality and other forms of emerging media?
As we increasingly rely on computers and mobile devices to support everyday tasks such as bill paying,
internet browsing, and social communication, both new opportunities and new challenges emerge for those with
physical and/or cognitive disabilities. My interest in computer accessibility goes beyond simply investigating
how computers can be universally usable (e.g., touchscreen accessibility) but also in how computers can be used to
make the world more accessible as well (e.g., studying sidewalk accessibility).
Although my methods extend largely from Ubiquitous Computing and Human-Computer Interaction, my research is additionally
informed by perspectives in design, information visualization, economics, and behavioral and environmental
psychology. I also apply knowledge from data-intensive areas such as machine
learning and signal processing to help build and evaluate my sensing systems. My research process is
iterative, often beginning with lightweight formative studies and, crucially, concluding with field
deployments of working technology. In this way, I am interested not only in building new technologies
but in studying their actual effectiveness in the field. Finally, as my work is often interdisciplinary,
I frequently collaborate with researchers both within various sub-disciplines of computer science
(e.g., machine learning) as well as outside of computer science (e.g., electrical engineering and psychology).
I am looking for and passionate about investigating the role of technology in solving high-value social problems.
If this interests you, please contact me
so that we can setup a time to chat about mutual interests and potential research projects. Also, read this