Coen van den Elsen

Staff Scientist at digiLab, working on trustworthy machine learning for science, nature and society.

Coen van den Elsen

About

My objective is to make a meaningful contribution to solving the world's environmental, sustainability and social challenges. To achieve this, I aim to combine my deep interest in the environment, human behaviour, and culture with the study of technology, particularly in the area of Artificial Intelligence. I also draw on my passion for art, creativity and serendipity, because I believe the most meaningful innovation happens where science and imagination meet. Feel free to reach out!

Experience

Staff Scientist

Oct 2026 - Present

digiLab, London, UK

Helping shape the research directions in theLab. Trustworthy AI for high stakes challenges like nuclear fusion, renewable energy and environmental protection, with specialist models that fit on a device.

AI Research Engineer

Jan 2025 - Jul 2026

OceanOS, London, UK

Developed a marine foundation model using geospatial data to support oceanic intelligence and marine conservation.

  • Designed a model architecture and pretraining strategy capable of handling spherical spatiotemporal marine data and land-ocean semantics.
  • Created a terabyte-scale geospatial pretraining dataset, preprocessing Xarray datasets from NetCDF into an optimal Zarr v3 layout.
  • Built a Dockerized multi-GPU training pipeline on cloud platforms, with failsafes, unit tests and automatic cloud uploads during and after runs.
  • Monitored the environmental cost of training with CodeCarbon.
  • Optimised the training pipeline to be 35x faster without performance loss.

Teaching Assistant, FNWI

Sep 2020 - Jan 2025

University of Amsterdam, Amsterdam, NL

Led tutorials for around 30 first- and second-year students, and supported instruction in Programming, Linear Algebra, Calculus and Optimisation, Information Visualization, and study orientation and career.

Mentor

Sep 2021 - Jul 2022

University of Amsterdam, Amsterdam, NL

Mentored a group of 30 second-year students, providing academic and peer support.

Education

MSc Artificial Intelligence

Sep 2023 - Jul 2026

University of Amsterdam, Amsterdam, NL

Graduated cum laude.

Exchange Program

Jul 2022 - Dec 2022

University of Cape Town, Cape Town, South Africa

Marine Resources and Geography, Development and Sustainability.

BSc Natural and Social Sciences

Sep 2019 - Jul 2023

University of Amsterdam, Amsterdam, NL

Specialisation in Artificial Intelligence. Honors programme. GPA 8.02 / 10.

Projects & research

MSc thesis, University of Amsterdam. Supervisor David Wessels, examiner Erik Bekkers. Grade 8.5.

How geometric inductive biases shape weather-model skill and physical fidelity, isolating one design choice at a time on global ERA5. Introduces Platonic-Erwin, a linearly-scaling ball-tree transformer with roto-translation group equivariance. Symmetry helps as an inductive bias but not as a hard constraint: scale buys deterministic skill, geometry buys spectral fidelity, calibration and parameter efficiency.

Thesis PDF Code

Published at SIGIR 2025, University of Amsterdam.

Replicated and extended NevIR to assess how IR models handle negation. Only cross-encoders and listwise LLM re-rankers reached moderate performance, still below human level, and fine-tuning across negation datasets generalised poorly.

Deep Learning 2 project, University of Amsterdam.

Proposed a novel class of equivariant transformers, using simplicial complexes and Clifford algebra to capture full symmetry group equivariance.

Predicting Perceived Attributes of Urban Images

2022

BSc thesis, University of Amsterdam.

Used GIST features to cluster Amsterdam street scenes, and explored how well those clusters capture perceived attributes of urban environments.

Robustness Against Label Noise in Road Defect Severity Estimation

2021

Learning and Deciding project, University of Amsterdam.

Researched CNN-based road defect severity estimation and classification, studied the impact of label noise and proposed robustness strategies.

Writing

9 November 2026

Our coding brain

The Obsidian vault that runs our coding agents.

With Robin Opdam, on Substack.

24 July 2026

A Solid Research Template

Efficient, trustworthy ML research: guardrail tests, performance callbacks and provenance, wired for Claude Code.