Department of Computer Science
Northwestern, Evanston, IL


May 2017
Presenting two papers at CHI and then off to ICWSM to present our work on Wikipedia and Google!

February 2017
Our paper on the interdependence of Google and Wikipedia has been accepted to ICWSM! Product of another great collaboration with Connor McMahon!

December 2016
A paper and a note accepted to CHI 2017! Thanks to my wonderful collaborators at GroupLens and the folks at Google for the internship opportunity!

September 2016
Finished an awesome summer with the good folks in the user experience research team for Google Maps. Now to start at Northwestern University, where I'm excited to meet and start working with all of the amazing labs while also continuing work with the amazing GroupLens Center for Social and Human-Centered Computing!

April 2016
Should have announced this a few months ago, but very very very excited to join the UX team at Google Maps this summer for an internship!

April 2016
Excellent blog post by Hannah Miller on our recent ICWSM 2016 paper about miscommunication that arises from emojis. Give it a read!

March 2016
Presented work on how biases arise in research that uses crowd-derived geographic information at the AAAI Spring Symposium on Observational Studies through Social Media and Other Human-Generated Content! The phonetic pronunciation of the much-shortened acronym (OSSM) sums up the workshop quite nicely.

January 2016
Paper on emoji miscommunication accepted to ICWSM 2016! Awesome collaboration with fellow GroupLens students Hannah Miller, Jacob Thebault-Spieker, and Stephen Chang as well as professors Loren Terveen and Brent Hecht.

December 2015
Two papers to CHI accepted!

About Me

I am a fourth-year computer science PhD student with Dr. Brent Hecht at the People, Space, & Algorithms (PSA) Computing Group at Northwestern University. I am primarily researching how we might design algorithms to account for geography and associated biases in data and variation in human behavior. I implement and experiment with various algorithms (e.g., geolocation, vehicle routing, sentiment analysis), exploring how they perform for different populations and seeking to incorporate in and optimize on more human-centric metrics. I also engage strongly with the algorithmic auditing and transparency field.



Klein, M., Zhao, J., Ni, J., Johnson, I., Hill, B.M., and Zhu, H. Quality Standards, Service Orientation, and Power in Airbnb and Couchsurfing. Proceedings of the ACM on Human-Computer Interaction (PACM HCI / CSCW '17). Vol. 1, No. 1, Article 58.
Preprint PDF

UbiComp 2017 (PACM IMWUT)
Johnson, I., Henderson, J., Perry, C., Schöning, J., and Hecht, B. Beautiful...but at What Cost? An Examination of Externalities in Geographic Vehicle Routing. Proceedings of the ACM on Interactive, Mobile, Wearable, and Ubiquitous Technologies (PACM IMWUT / UbiComp '17). Vol. 1, No. 2, Article 15.
Preprint PDF | Code | Ubicomp '17 Slides

ICWSM 2017
McMahon, C.*, Johnson, I.*, and Hecht, B. The Substantial Interdependence of Wikipedia and Google - A Case Study on the Relationship between Peer Production Communities and Intelligent Technologies. AAAI International Conference on Web and Social Media 2017.
Paper PDF | Chrome Extension | ICWSM '17 Slides | Best Paper Nomination | *Co-first-authors

CHI 2017
Johnson, I., McMahon, C., Schöning, J., and Hecht, B. The Effect of Population and "Structural" Biases on Social Media-based Algorithms -- A Case Study in Geolocation Inference Across the Urban-Rural Spectrum. ACM Conference on Human Factors in Computing Systems 2017.
Paper PDF | CHI '17 Slides

CHI 2017
Johnson, I., Schwanda Sosik, V., and Ballard, K. Stranger Searching in a Strange Land: The Impact of Familiarity on Local Search. ACM Conference on Human Factors in Computing Systems 2017. Short Paper.
Paper PDF

ICWSM 2016
Miller, H., Thebault-Spieker, J., Chang, S., Johnson, I., Terveen, L., and Hecht, B. "Blissfully happy" or "ready to fight": Varying Interpretations of Emoji. AAAI International Conference on Web and Social Media 2016.
Paper PDF | Blog Post

CHI 2016
Johnson, I., Sengupta, S., Schöning, J., and Hecht, B. The Geography and Importance of Localness in Geotagged Social Media. ACM Conference on Human Factors in Computing Systems 2016.
Paper PDF | CHI '16 Slides | Code

CHI 2016
Johnson, I., Lin, Y., Li, T., Hall, A., Halfaker, A., Schöning, J., and Hecht, B. Not at Home on the Range: Peer Production and the Urban/Rural Divide. ACM Conference on Human Factors in Computing Systems 2016.
Paper PDF | CHI '16 Slides | Maps

IJCAI 2015
Sen, S., Johnson, I., Harper, R., Mai, H., Olsen, S., Mathers, B., Vonessen, L., Wright, M., and Hecht, B.. Towards Domain-Specific SR: A Case Study from Geography. International Joint Conference on Artificial Intelligence 2015.
Paper PDF

Workshops and Miscellaneous Talks

Wikimedia Research Showcase Talk
Johnson, I. Wikipedia and the Urban-Rural Divide. 15 February 2017.
Description and Slides

CSCW 2017
Johnson, I. and Hecht, B. Inferred Profiles: Examining How People Understand and Control What Algorithms Infer about Them. ACM Conference on Computer-Supported Cooperative Work and Social Computing 2017 Workshop on Networked Privacy.
Paper PDF

AAAI Spring Symposium 2016
Johnson, I. and Hecht, B. Structural Causes of Bias in Crowd-derived Geographic Information: Towards a Holistic Understanding. AAAI 2016 Spring Symposium on Observational Studies through Social Media and Other Human-Generated Content.
Paper PDF | OSSM '16 Slides