Hi! I'm a final-year PhD student at QMUL, interested in AI safety and interpretability. A recent focus of my work has been on designing scalable ways to break down machine learning models’ computations into parts we can interpret as humans--both to better understand their behavior and to steer them toward outcomes more aligned with our values.

Over summer 2025 I'll be a visiting student at the University of Oxford, and I previously spent a few great months as an Honorary Associate at the University of Wisconsin–Madison with Grigorios Chrysos. Prior to this, I was an intern at Huawei Noah's Ark Lab. I'm lucky to be supervised by a great team including Ioannis Patras, Mihalis A. Nicolaou, and Yannis Panagakis.

News

• [2024.11] Recognized as a Top Reviewer at NeurIPS'24
• [2024.09] 1 paper accepted at NeurIPS'24 (on scalable expert specialization in MoEs)
• [2024.09] Started at UW-Madison as an Honorary Associate
• [2024.06] 1 paper accepted at TPAMI (extending our ICLR'23 work)
• [2023.09] 1 paper accepted at NeurIPS'23 (on semantic subspaces in vision-language models)
• [2023.07] Started as a PhD Research Intern with Jiankang Deng at Huawei R&D UK
• [2023.01] 1 paper accepted at ICLR'23 (on parts/appearance decomposition in GANs)
• [2021.09] Started as a PhD student at QMUL

Selected publications

• "Multilinear Mixture of Experts: Scalable Expert Specialization through Factorization"
  J. Oldfield, M. Georgopoulos, G. G. Chrysos, C. Tzelepis, Y. Panagakis, M. A. Nicolaou, J. Deng, I. Patras
  NeurIPS, 2024
  [pdf | code | project page]
• "Parts of Speech–Grounded Subspaces in Vision-Language Models"
  J. Oldfield, C. Tzelepis, Y. Panagakis, M. A. Nicolaou, I. Patras
  NeurIPS, 2023
  [pdf | code | project page]
• "PandA: Unsupervised Learning of Parts and Appearances in the Feature Maps of GANs"
  J. Oldfield, C. Tzelepis, Y. Panagakis, M. A. Nicolaou, I. Patras
  ICLR, 2023 (& TPAMI 2024)
  [pdf | code | project page]
• "Tensor methods in computer vision and deep learning"
  Y. Panagakis, J. Kossaifi, G. G. Chrysos, J. Oldfield, M. A. Nicolaou, A. Anandkumar, S. Zafeiriou
  Proceedings of the IEEE, 2021
  [pdf | code]

Experience

• [2024.09–2024.12] Honorary Associate (University of Wisconsin–Madison, Madison)
• [2023.07–2024.01] Research Intern (Huawei Noah's Ark Lab, London)
• [2019.11–2020.09] Research Intern (The Cyprus Institute, Nicosia)

Invited talks

• [2024.06] Tensor Decompositions in Large Scale Deep Learning (Archimedes Research Unit, Athens)

Teaching

• [2024–2024] Teaching assistant for Deep Learning and Computer Vision (QMUL, ECS795P)
• [2021–2022] Teaching assistant for Machine Learning (QMUL, ECS708)
• [2021–2021] Teaching assistant for Artificial Intelligence (QMUL, ECS629)

Awards

• [2024] Top Reviewer: NeurIPS 2024