Profile of Arinbjörn Kolbeinsson

Arinbjörn Kolbeinsson

I'm a visiting scholar at The University of Virginia. My work involves developing and creating machine learning systems that improve health and quality of life.

  • PhD: Deep learning for health outcome prediction
    Imperial College London, 2021
  • MRes in Biomedical Research
    Imperial College London, 2016
  • MEng in Bioengineering
    Imperial College London, 2015
  • Personalised health outcome prediction and action optimisation
  • Time-series analysis to identify changes or anomalies in temporal data
  • Multi-modal learning
  • Tensor methods for improving robustness and generalisability
University of Virginia

I am currently a visiting scholar at the University of Virginia where I collaborate with Tom Hartvigsen on advancing the efficiency, computational speed, and ecological footprint of Large Language Models (LLMs). In this capacity, I am also contributing to the development of cutting-edge model editing techniques.


At Evidation Health I developd machine learning methods to predict health outcomes based on high-frequency multi-modal data. I also collaborated on research with academic institutions on differential privacy in machine learning.


Imperial College London

During my PhD at Imperial College London, I developed a deep neural network model to predict brain age difference using over 20,000 MRI scans from UK Biobank. Through a phenome-wide association analysis, we identified significant associations between this learnt biomarker and over 40 traits, including cognitive diseases and poorer cognitive function, highlighting relationships and possible causation between brain and systemic health.

Central to my research was developing new machine learning models to analyse these complex health data. I created a method to learn features from 3D brain volumes (open access version) with a stochastic tensor regression layer to better leverage the structural information in the images. Part of this work was done during my internship at Samsung AI, in collaboration with Professor Anima Anandkumar’s group at Caltech.

Publication spotlight
  • Arinbjörn Kolbeinsson, Naman Shukla, Akhil Gupta, Lavanya Marla, and Kartik Yellepeddi. "Galactic Air Improves Ancillary Revenues with Dynamic Personalized Pricing." INFORMS Journal on Applied Analytics (2022).
  • Arinbjörn Kolbeinsson, Jean Kossaifi, Yannis Panagakis, Adrian Bulat, Anima Anandkumar, Ioanna Tzoulaki, and Paul Matthews. "Tensor Dropout for Robust Learning," in IEEE Journal of Selected Topics in Signal Processing, doi: 10.1109/JSTSP.2021.3064182 (2021).
  • Akhil Gupta, Lavanya Marla, Ruoyu Sun, Naman Shukla and Arinbjörn Kolbeinsson. “PenDer: Incorporating Shape Constraints via Penalized Derivatives”. In Proceedings of the AAAI Conference on Artificial Intelligence (2021).
  • Arinbjörn Kolbeinsson, Sarah Filippi, Yannis Panagakis, Paul M. Matthews, Paul Elliott, Abbas Dehghan, and Ioanna Tzoulaki. "Accelerated MRI-predicted brain ageing and its associations with cardiometabolic and brain disorders." Scientific Reports 10, no. 1 (2020): 1-9.
  • Kossaifi, Jean, Zachary C. Lipton, Arinbjörn Kolbeinsson, Aran Khanna, Tommaso Furlanello, and Anima Anandkumar. "Tensor regression networks." Journal of Machine Learning Research 21, no. 123 (2020): 1-21.
  • See all on my Google Scholar profile.

Want to get in touch? Reach me on Threads, Mastodon, LinkedIn or GitHub.