Sierra Wyllie

Sierra Wyllie

Computer Science MSc student at the University of Toronto

University of Toronto Computer Science

CleverHans Lab

Vector Institute

Biography

I am an incoming MSc student in computer science at the University of Toronto, where I am co-advised by Professor Nicolas Papernot. I am also a DeepMind MSc fellow for 2025-2026.

My research focuses at the intersection of ML fairness and security, as motivated by perspectives in AI ethics. That means I view ML fairness as a sort of security for the least powerful and privileged. For example, one of my recent works looks at a phenomenon called model-induced distribution shifts, which is when a model’s outputs contribute to changes in future training sets, biasing newer models. Over time, this can lead to negative impacts to minoritized groups, including their eventual erasure from datasets in extreme cases.

Another of my recent works (with Nick Jia) looked at detecting backdoor attacks. However, unlike many works which assume the defender is a powerful model trainer, our paper works in the setting the defender is a low-resource cloud compute client who needs to ensure their model was not backdoored by a compute provider.

Previously

Before graduate school, I completed my BASc in Engineering Science at the University of Toronto, where I also became a JEDI (through a certificate in Justice, Equity, Diversity and Inclusion). I also spent two years with the Gatton Academy of Mathematics and Science, where for my final two years of high school I took college courses at Western Kentucky University (for free). There, I was advised by Ismail Abumuhfouz and Michael Galloway.

Download my CV.

Interests
  • Artificial Intelligence
  • Trustworthy Machine Learning
  • Ethics of AI
Education
  • MSc in Computer Science, 2026

    University of Toronto

  • BaSC in Engineering Science - Machine Learning, 2025

    University of Toronto

  • HS Diploma, 2020

    Gatton Academy of Mathematics and Science

  • HS Diploma, 2020

    Henry Clay High School Liberal Arts Academy

Experience

 
 
 
 
 
Research Intern
May 2024 – Aug 2025 Lausanne, Switzerland
Investigating privacy and harms in machine learning systems, mentored by Prof. Carmela Troncoso in the Security and Privacy Engineering (SPRING) lab.
 
 
 
 
 
Research Intern
May 2021 – Present Toronto, Canada
Investigating fairness in machine learning, mentored by Prof. Nicolas Papernot in the CleverHans trustworthy machine learning lab.
 
 
 
 
 
Intern
Jun 2022 – Aug 2022 Paris, France (Remote)
Worked as a technical intern with the OECD Expert Group on AI Compute and Climate with world leaders in AI, AI compute, and international policy. Developed frameworks to accurately explain importance of AI compute in national development.
 
 
 
 
 
Electrical and Software Engineering Intern
Jun 2020 – Aug 2020 Lexington, KY, USA
Assembled electrical components currently aboard the International Space Station for client R&D projects. Introduced artificially intelligent and autonomous solutions including UIs, fluid detection and direction tracking, and phase microscopy.
 
 
 
 
 
Research Student
Western Kentucky University
Jan 2018 – May 2020 Bowling Green, Kentucky, USA
Built classification system using ML in sci-kit Python on CICIDS-2017 dataset. Presented at regional conferences, such as ACM Mid-Southeast, and won best undergraduate poster. Also conducted a survey of metaheuristics for load balancing in WKU Cloud Lab’s Bioinformatics Cloud. Presented at WKU Student Reach Conference in March 2019.

Recent Publications

(2024). Backdoor Detection Through Replicated Execution of Outsourced Training. In SaTML'25.

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(2024). Fairness Feedback Loops: Training on Synthetic Data Amplifies Bias. In FAccT'24.

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(2023). Confidential-PROFITT: Confidential PROof of FaIr Training of Trees. In ICLR'23.

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(2022). Washing The Unwashable : On The (Im)possibility of Fairwashing Detection. In NeurIPS'22.

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