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I am an assistant professor in the [Department of Computer
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Science](https://www.cs.cornell.edu/) at [Cornell
University](https://www.cornell.edu).
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**I am always looking for good students!**
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Previously, I was an assistant professor in the [Department of Computer
Sciences](https://www.cs.wisc.edu/) at the [University of
Wisconsin--Madison](https://www.wisc.edu), and a postdoc at the [Department of
Computer Science](https://www.cs.cornell.edu/) at [Cornell
University](https://www.cornell.edu/), and in the [Programming Principles,
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Logic, and Verification Group](http://pplv.cs.ucl.ac.uk/welcome/) at the
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[University College London ](https://www.ucl.ac.uk/ ). I was a graduate student in
the [Department of Computer Science ](https://cis.upenn.edu ) at the [University
of Pennsylvania](https://www.upenn.edu).
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I am funded by the National Science Foundation, the Office of Naval Research,
and Facebook Research.
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## Research Interests ##
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I design methods to **formally verify** that programs are correct, especially
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programs that use **randomization** . Such programs can be easy to show correct
on paper, but surprisingly challenging for computers to analyze. Accordingly,
my research blends ideas from two classical areas of computer science:
**randomized algorithms** from theoretical computer science (**TCS**) and
**formal verification**.
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Drawing inspiration from how humans reason about randomized algorithms, we can
build simpler and more automated verification techniques. In the past, I've
applied this approach to properties like **accuracy** , **incentive
compatibility**, Markov chain **mixing** , and various notions of **algorithmic
stability**.
A particular focus of my work has been [**differential
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privacy**](https://en.wikipedia.org/wiki/Differential_privacy), a rigorous
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definition of privacy that is currently under extensive study.
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I have investigated a variety of formal methods---such as [**type
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systems**](https://en.wikipedia.org/wiki/Type_system) and [**program
logics**](https://en.wikipedia.org/wiki/Hoare_logic)---to verify that programs
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are differentially private.
From a more traditional algorithms perspective, I am also interested in applying
differential privacy to optimization, machine learning, and mechanism design.
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## Teaching ##
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- **Data Structures and Functional Programming (CS 3110)**: [S23 ](https://www.cs.cornell.edu/courses/cs3110/2023sp/ ) [S22 ](https://www.cs.cornell.edu/courses/cs3110/2022sp/ )
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- **Category Theory for Computer Scientists (CS 6117)**: [F22 ](teaching/f22/cs6117 )
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- **Foundations of Probabilistic Programming (CS 6182)**: [F21 ](teaching/f21/cs6182 )
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- **Reasoning about Probabilistic Programs** < br >
**Invited Course at [OPLSS 2021](https://www.cs.uoregon.edu/research/summerschool/summer21/index.php)** :
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[[slides ](https://justinhsu.net/files/slides/oplss21.pdf )] [[recordings ](https://www.cs.uoregon.edu/research/summerschool/summer21/topics.php )]
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- **Security and Privacy in Data Science (CS 763)**: [F20 ](teaching/f20/cs763/ ) [F19 ](teaching/f19/cs763/ )
- **Introduction to the Theory and Design of PL (CS 538)**: [S20 ](teaching/s20/cs538/ ) [S19 ](teaching/s19/cs538/ )
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- **Topics in Security and Privacy Technologies (CS 839)**: [F18 ](teaching/f18/cs839/ )
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## Service ##
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- **2024** OOPSLA
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- **2023** CSF, ICALP-B, LICS, OOPSLA, MFPS
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- **2022** POPL, PLDI, MFPS (co-chair)
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- **2021** ESOP, PLMW@POPL, CSF, AAAI, COLT, WoLLIC, MFPS
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- **2020** AAAI, CSF, LAFI, WoLLIC, PLMW@POPL, OOPSLA (ERC)
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- **2019** POPL, PLMW@POPL, POST, CSF, DARS (co-chair)
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- **2018** LICS, WWW
- **2017** FCS, TPDP, MFPS
- **2016** PLDI (ERC)
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## Blogging ##
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I've greatly enjoyed blogging for [PL Perspectives ](https://blog.sigplan.org/blog/ )!
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- [**Teaching Category Theory to Computer Scientists** ](https://blog.sigplan.org/2023/04/04/teaching-category-theory-to-computer-scientists/ )
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- [**Verifying Randomized Algorithms: Why and How?** ](https://blog.sigplan.org/2020/10/20/verifying-randomized-algorithms-why-and-how/ )
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- [**Re-Imagining the “Programming Paradigms” Course** ](https://blog.sigplan.org/2021/01/28/re-imagining-the-programming-paradigms-course/ )
- [**Programming Languages Mentoring Workshop: Ten Years Later** ](https://blog.sigplan.org/2021/05/11/programming-languages-mentoring-workshop-ten-years-later/ )
