Maximiliano Isi

Assistant Professor, Department of Astronomy, Columbia University
Associate Research Scientist, Center for Computational Astrophysics, Flatiron Institute

We use gravitational waves to study black holes, from the final ring of a merger remnant to the properties of the whole population, and we build the statistical and machine-learning tools that make those measurements possible.

Portrait of Maximiliano Isi

Photo: La Diaria, Juan Manuel Ramos

I am a gravitational-wave astrophysicist. My group creates new ways to exploit LIGO, Virgo and KAGRA measurements to answer questions about gravity, black holes and neutron stars, while paving the way for future instruments like LISA. Our work spans black-hole ringdowns and tests of general relativity, the astrophysical population of merging black holes, and machine-learning and statistical methods for gravitational-wave data analysis.

Before joining Columbia University and the Flatiron Institute, I was a Flatiron Research Fellow at the Center for Computational Astrophysics and a NASA Einstein Fellow at MIT. I obtained my PhD in Physics from Caltech in 2019, where I was part of the LIGO Laboratory, and I have been a member of the LIGO Scientific Collaboration since 2012.

Research

Group

The group brings together 4 postdoctoral researchers, 3 graduate students and 4 undergraduates across Columbia University and the Flatiron Institute's Center for Computational Astrophysics.

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Selected publications

h-index 113 / 37  \|  publications 259 / 68  \|  citations 121k / 5.2k first number includes LIGO collaboration papers; second number excludes them — via INSPIRE, September 28, 2026
  1. ApJ
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    Identifying Compact Chirping SMBHBs in LSST using Bayesian Analysis
    Chengcheng Xin*, Maximiliano Isi, Will M. Farr, and 1 more author
    Astrophys. J., Jun 2026
  2. ApJ
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    Hints of spin-magnitude correlations and a rapidly spinning subpopulation of binary black holes
    Asad Hussain*, Maximiliano Isi, and Aaron Zimmerman
    Astrophys. J., Nov 2026
  3. ApJ
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    Physical Models for the Astrophysical Population of Black Holes: Application to the Bump in the Mass Distribution of Gravitational Wave Sources
    Jacob Golomb*, Maximiliano Isi, and Will Farr
    Astrophys. J., Nov 2024
  4. PRL
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    Testing the Black-Hole Area Law with GW150914
    Maximiliano Isi, Will M. Farr, Matthew Giesler, and 2 more authors
    Phys. Rev. Lett., Nov 2021
  5. PRL
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    Testing the no-hair theorem with GW150914
    Maximiliano Isi, Matthew Giesler, Will M. Farr, and 2 more authors
    Phys. Rev. Lett., Nov 2019

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