The merged NASA Hubble Fellowship (Hubble, Einstein and Sagan) Announcement of Opportunity is available at

Current NASA Hubble Postdoctoral Fellows
Nicholas Kern: NASA Postdoctoral Fellow 2023-2026

Rohan Naidu: NASA Hubble Fellow 2022-2025
Rohan Naidu is broadly interested in the first galaxies that formed after the Big Bang. His research addresses when these galaxies emerged to illuminate the universe, how they ionized the intergalactic reservoirs of hydrogen, and how they synthesized the elements that would one day seed life on Earth. Rohan pursues these galaxies with a near-and-far approach. As one of the first users of NASA’s James Webb Space Telescope, he is leading direct studies of galaxies at the highest redshifts. And through archaeological studies of our own galaxy, aided by ESA’s Gaia satellite, he has excavated some of the most ancient systems that lie buried within the Milky Way.


                                                 Riccardo Arcodia: NASA Postdoctoral Fellow 2022-2025
Riccardo Arcodia’s research focuses on studying transient and persistent accretion events onto black holes of different masses, from X-ray and optically bright active supermassive black holes to massive black holes in low-mass galaxies, down to stellar-mass black holes. He significantly contributed to the discovery and study of a new rare outlier in the family of extragalactic X-ray transients, the so-called quasi-periodic eruptions, using the eROSITA X-ray telescope and several other facilities. He is now at the forefront of the efforts to study their X-ray and multi-wavelength properties, in an attempt to unveil more about their origin.



Kishalay De: NASA Einstein Postdoctoral Fellow 2021- (future Kavli Postdoctoral Fellow, September 2024 – )Kishalay De’s research interests lie in the transient optical/infrared sky to search for cataclysmic explosions in the Milky Way and in distant galaxies. He obtained his PhD from the California Institute of Technology in 2021, where he worked on building the largest volume-limited sample of supernovae using the Zwicky Transient Facility (ZTF) survey to search for faint thermonuclear and core-collapse supernovae. His work led to the identification of new classes of explosions arising from helium shell detonations on white dwarfs and the deaths of extremely stripped massive stars. De helped build the first wide-field infrared time domain survey, Gattini-IR at Palomar Observatory, that surveys three quarters of the sky every two nights. By looking in the near-infrared, De’s work revealed a population of dust obscured eruptions (novae, X-ray binaries, microlensing events and young stars) that are missed in optical surveys. De is currently working on systematic searches for neutron stars and black holes in the Milky Way via variable and erupting optical/infrared counterparts of Galactic X-ray sources, using time domain surveys like ZTF, Gattini-IR, WINTER and in the future, with the Vera Rubin observatory and the Nancy Grace Roman space telescope.

Past NASA Hubble Postdoctoral Fellows

Anna-Christina Eilers: NASA Hubble Postdoctoral Fellow 2022-2024
Aaron Smith: NASA Einstein Postdoctoral Fellow 2018-2022
Hsin-Yu Chen: NASA Einstein Postdoctoral Fellow 2020-January 2023
Maximiliano Isi: NASA Einstein Postdoctoral Fellow 2018-2021
Dheeraj (DJ) Pasham: NASA Einstein Postdoctoral Fellow 2016-2019
Diana Dragomir: NASA Hubble Postdoctoral Fellow 2016-2019
Paul Torrey: NASA Hubble Postdoctoral Fellow 2016-2018
Rongmon Bordoloi: NASA Hubble Postdoctoral Fellow 2015-2018
Jack Steiner: NASA Einstein Postdoctoral Fellow 2015-2018
Joey Neilsen: NASA Hubble Postdoctoral Fellow 2014-2017
Aleksander Sadowski: NASA Einstein Posdoctoral Fellow 2014-2017
Meng Su: NASA Einstein Postdoctoral Fellow 2012-2015