Hi!

I’m currently a PhD student at the University of Chicago advised by Blase Ur.

Prior to that, I was a software engineer at Block. I worked on Cash App’s marketing engineering team and Square’s user authentication team.

I did my undergrad at Northeastern University and got my BS in computer science. During that time, I did some research focusing on mobile privacy (specifically, media exfiltration from apps) and interned at a couple of swell startups.

In my free time, I like shooting film photography, backpacking, and hanging out with my dog. Usually all together!

Education

University of Chicago ・ Chicago, IL
currently pursuing a PhD!
Sep 2022 - present

Northeastern University · Boston, MA
Bachelor of Science in Computer Science
Aug 2013 - May 2018

Publications

Arthur Borem, Elleen Pan, Olufunmilola Obielodan, Aurelie Roubinowitz, Luca Dovichi, Michelle L Mazurek, Blase Ur
Data Subjects’ Reactions to Exercising Their Right of Access
USENIX Security Symposium, August 2024
PDF

Leona Lassak, Elleen Pan, Blase Ur, Maximilian Golla
Why Aren’t We Using Passkeys? Obstacles Companies Face Deploying FIDO2 Passwordless Authentication
USENIX Security Symposium, August 2024
PDF, extended version

Elleen Pan, Jingjing Ren, Martina Lindorfer, Christo Wilson, David Choffnes
Panoptispy: Characterizing Audio and Video Exfiltration from Android Applications
Proceedings on Privacy Enhancing Technologies (PETS), July 2018
also presented at FTC PrivacyCon, June 2019
PDF, site, press

Industry Work

Block · Atlanta, GA · Aug 2018 - Sep 2022
Software Engineer

• Marketing Eng, Cash App (Jan 2021 - Sep 2022)
  Worked on an internal tool used by Cash App’s marketing team to carry out various campaigns, such as (pretty large 🤑) fiat, BTC, and stock giveaways through social media posts, QR codes, etc. Did frontend work in React and backend work in Kotlin + SQL.
• Auth, Square (Aug 2018 - Jan 2021)
  Built secure features and protective measures for the login flow, two-factor authentication, session management, passwords, etc. Mostly backend work in Java + SQL and Redis.

Placester · Boston, MA · July - Dec 2016
Engineering Co-op
Wrote React components for use in site templates, worked with MLS listing data in MongoDB & MySQL, fixed bugs in existing codebase