Matthew O'Callaghan portrait

Matthew O'Callaghan

Astronomer · Postdoctoral Researcher · University of Cambridge

Google Scholar NASA ADS arXiv GitHub LinkedIn mo503@cam.ac.uk

Dust Mapping and Stellar Parameter Inference

Data-driven extinction and reddening inference from Gaia distances and photometric surveys, with probabilistic modeling of intrinsic colors to recover robust stellar and dust posteriors.

Robust Simulation-Based Inference

Methods that remain reliable under simulator misspecification, with careful summary-statistic learning and posterior calibration to bridge simulation and observation.

Supernovae Cosmology

Using BayeSN in lensing-aware inference pipelines to constrain cosmological parameters, including H0, from Type Ia supernova observations.

Timeline

  • Sep 2026

    I have accepted an offer to work at the Centre for Astrophysics | Harvard & Smithsonian with Catherine Zucker, where I will be looking at stellar paramter and dust inference for Nasa's Nancy Grace Roman Space Telescope.

  • Feb 2026

    I have started a postoctoral position at the University of Cambridge working with Kaisey Mandel on infererence for supernovae cosmology.

  • Nov 2025

    I succesfully defended my thesis at the University of Cambridge!

  • Nov 2025

    My paper "Data Driven Dust Inference at High Galactic Latitudes using Probabalistic Machine Learning" was accepted for publication at MNRAS.

  • Dec 2024

    My paper "Quantifying Extinction at High Galactic Latitudes" has been accepted for publication in MNRAS.

  • Mar 2024

    I have started a six-month research assistant position at the National Observatory in Athens, working on inference for atmospheric dust particles.

  • Mar 2022

    I have been awarded the Loyds Exhebition Prize and Gold Medal from Trinity College Dublin.

  • Oct 2021

    I have started my PhD in Astronomy and Data Intensive Sciences as a Gianna Angelopoulous Science and Innovation Scholar at the University of Cambridge, where I will be working with Gerry Gilmore and Kaisey Mandel.

  • Jul 2021

    I have graduated from the Part III MASt in Mathematics at the University of Cambridge.

  • Nov 2020

    Graduated with B.A. in Mathematics from Trinity College Dublin.