Haojian Jin


I'm an Assistant Professor in Halıcıoğlu Data Science Institute (HDSI) and Department of Computer Science and Engineering (affiliate) at UC San Diego.

I am a human-centered system researcher. My research lies at the intersection of human-computer interaction, privacy and security, and systems, focusing primarily on two conflicting questions:

  • How can we design systems that meaningfully improve people’s lives?
  • How can we prevent those systems from becoming unsafe as they grow more proactive and powerful? ?

I am recruiting PhD students and MS/undergrad research interns. See more details here.

Some Current Research Directions:
Effective Privacy Design

A World Model for Privacy Design: Build a closed-ended representation of privacy design space that helps predict the consequences of specific design decisions and automates compliance. Papers: [Oakland'25] [PETS'25] [CHI'24] [CHI'24] [CHI'22] [TOCHI'21]
Software: [Panopticon];
Course: [Designing Privacy-Sensitive Data Systems]

aimanifest

Parental Control for GenAI: control AI models' behavior using human specified policies.
Papers: [CCS'24] [ICLR'25]
Software: Moderator, Game Arena

… and a bunch of earlier stuff:
modular privvacy flows

Modular Privacy Flows: implement fine-grained data access using operators and manifests.
Papers: [IEEE S&P 2022] [Dissertation summary] [IMWUT'18]
Software: Who knows what about us and why?, Peekaboo

software design cooking

Sensor-based Systems: Radio frequency, Audio, and Actuation.
Papers: [CACM'21] [MobiCom'19] [MobiSys'18] [IMWUT'17] [UIST'15] [UIST'15]
Patents: [11 Granted US Patents]