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<!doctype html>
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<title>Matthew Regehr</title>
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<meta name="author" content="Matthew Regehr" />
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<h1>Matthew Regehr</h1>
<img src="/headshot.jpeg" />
<p>
Hi! I am a PhD student in the <a target="_blank" href="https://cs.uwaterloo.ca">Cheriton School of Computer Science</a> at the University of Waterloo. I am grateful to be advised by <a target="_blank" href="http://www.gautamkamath.com">Gautam Kamath</a>.
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<p>
My research interests are broadly machine learning theory and differential privacy. My current research projects focus on the theory of privacy accounting, locally private hypothesis selection, and fairness in machine learning.
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<p>
Please feel free to take a look at my <a target="_blank" href="/cv.pdf">CV</a> (updated December 2024).
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<h2>Contact</h2>
<ul>
<li><a href="mailto:[email protected]">matt dot regehr at uwaterloo dot ca</a></li>
<li><a target="_blank" href="https://www.linkedin.com/in/matthew-regehr-237121226">LinkedIn</a></li>
<li><a target="_blank" href="https://bsky.app/profile/matt19234.bsky.social">Bluesky</a></li>
</ul>
<h2>Publications and Manuscripts</h2>
<h3>Avoiding Pitfalls for Privacy Accounting of Subsampled Mechanisms under Composition (2024)</h3>
<h4>
Christian Lebeda*, Matthew Regehr*, Gautam Kamath, Thomas Steinke (*Equal contribution)
</h4>
<p>
To appear in <a target="_blank" href="https://satml.org">SaTML</a> 2025<br />
Manuscript available on <a target="_blank" href="https://arxiv.org/abs/2405.20769">[ArXiv]</a>
</p>
<h3>A Bias-Accuracy-Privacy Trilemma for Statistical Estimation (2023)</h3>
<h4>
Gautam Kamath, Argyris Mouzakis, Matthew Regehr, Vikrant Singhal, Thomas Steinke, Jon Ullman (Alphabetical)
</h4>
<p>
To appear in <a target="_blank" href="https://www.tandfonline.com/toc/uasa20/current">Journal of the American Statistical Association</a><br />
Manuscript available on <a target="_blank" href="https://arxiv.org/abs/2301.13334">[ArXiv]</a>
</p>
<h3>An Elementary Proof that Q-learning Converges Almost Surely (2021)</h3>
<h4>
Matthew Regehr, Alex Ayoub
</h4>
<p>
Manuscript available on <a target="_blank" href="https://arxiv.org/abs/2108.02827">[ArXiv]</a><br />
</p>
<h3>Automatic Right Atrial Segmentation from Magnetic Resonance Imaging (2019)</h3>
<h4>
Matthew Regehr, Andrew Volk, Michelle Noga, Kumaradevan Punithakumar
</h4>
<p>
Published in <a target="_blank" href="https://ieeexplore.ieee.org/xpl/conhome/9091448/proceeding">17th IEEE International Symposium on Biomedical Imaging (ISBI 2020)</a><br />
Won best poster prize at the University of Alberta Faculty of Medicine & Dentistry 52nd Annual Summer Students' Research Day
</p>
<h2>Other Writing</h2>
The following are course projects that I've written:
<ul>
<li>University of Waterloo CS 798 Project: <a target="_blank" href="/cs_798_project.pdf">A Brief Survey of Private and Online Learning</a></li>
<li>University of Waterloo CS 860 Project: <a target="_blank" href="/cs_860_project.pdf">A Strange Square Complex and c<sup>3</sup>-Locally Testable Codes</a></li>
</ul>
<!-- I also made some dumb half-finished games as a kid:
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<li><a target="_blank" href="/ghost/">Ghost game</a></li>
<li><a target="_blank" href="/rocket_bob/">Rocket Bob</a></li>
<li><a target="_blank" href="/toasty_ember/">Toasty Ember</a></li>
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Thanks for visiting 😄
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