Maya Fishbach is a NASA Hubble Fellowship Program Einstein Postdoctoral Fellow. Maya uses gravitational waves to probe the universe’s most extreme objects — black holes and neutron stars. Her research aims to understand where, when and how these systems of merging compact objects are made. As a member of the LIGO Scientific Collaboration, she analyzes gravitational-wave data to study the population properties of colliding black holes and neutron stars, and to measure the expansion rate of the universe. Some of her research highlights include: the discovery of missing big black holes in the black hole mass spectrum (likely due to pair-instability supernovae), evidence that the black hole merger rate evolves with redshift, and the first standard siren measurement of the Hubble constant using a gravitational-wave event and a galaxy catalog.