• University of California, Santa Barbara September 2013–June 2018
  • Ph.D. Physics, Astrophysics Emphasis, June 2018
  • Thesis: Probing Late-Stage Stellar Evolution Through Robotic Follow-Up of Nearby Supernovae
  • Certificate in College and University Teaching, June 2018
  • M.A. Physics, Astrophysics Emphasis, June 2016
  • University of California, Berkeley August 2008–May 2012
  • B.A. Physics, Music Minor
  • High Distinction in General Scholarship
  • Center for Astrophysics | Harvard & Smithsonian, Cambridge, MA, USA September 2018–present
  • Postdoctoral Researcher
  • Time-Domain Research Group
  • Advisor: Edo Berger
  • Las Cumbres Observatory, Goleta, CA, USA January 2014–June 2018
  • Graduate Student Researcher
  • Global Supernova Project
  • Advisor: D. Andrew Howell
  • Planet Labs, San Francisco, CA, USA November 2012–June 2013
  • Spacecraft Engineer
  • Optical Systems/Instrumentation
  • Supervisor: William Marshall
  • Frascati National Laboratories, Frascati, Italy August–October 2012
  • DOE–INFN Summer Exchange Student
  • MoonLIGHT–ILN Experiment
  • Advisor: Simone Dell'Agnello
  • University of California, Berkeley, CA, USA May–July 2012
  • Emilio G. Segrè Intern
  • Physics 111 Advanced Laboratory
  • Advisor: Hartmut Häffner
  • Lawrence Berkeley National Laboratory, Berkeley, CA, USA May 2010–August 2011
  • Undergraduate Researcher
  • Daya Bay Reactor Neutrino Experiment
  • Advisor: Kam-Biu Luk
  • Santa Barbara City College, Santa Barbara, CA, USA August 2014–May 2018
  • Adjunct Instructor
  • Department of Earth and Planetary Science
  • ERTH 102 – Observational Astronomy Lab
  • University of California, Santa Barbara, CA, USA September 2013–June 2014
  • Teaching Assistant
  • Department of Physics
  • Astro 1 – Basic Astronomy
  • Astro 2 – History of the Universe
  • University of California, Berkeley, CA, USA June–August 2010 & 2011
  • Graduate Student Instructor
  • Department of Physics
  • Physics 8A & 8B – Introductory Physics
  • LSSTC Data Science Fellow September 2017–June 2019
  • Two-year training program for dealing with big data in astronomy
  • Hubble Space Telescope Program Principal Investigator March–May 2018
  • GO-15236: "The mystery of a supposed massive star exploding in a brightest cluster galaxy"
  • Hubble Space Telescope Proposal Review Panelist, Cycle 27 June 2019
  • Review observing proposals and make recommendations to the Time Allocation Committee
  • Santa Barbara Astro Lunch January 2017–June 2018
  • Organizer of weekly lunch talks by Santa Barbara locals and visitors
  • REU Summer Intern Program, Smithsonian Astrophysical Observatory June–August 2019
  • Advisor for a summer undergraduate research project
  • Worster Fellowship, UC Santa Barbara June–August 2016
  • Graduate student mentor for a summer undergraduate research fellowship
  • Pioneers in Engineering, UC Berkeley February–April 2011 & 2012
  • Robotics competition for Bay Area high school students
  • Astronomy on Tap Boston April 2019–present
  • Free, public astronomy presentations in the greater Boston area
  • AAS Astronomy Ambassadors January 2018
  • Professional development workshop for effective communication with the public
  • Astronomy on Tap Santa Barbara March 2016–June 2018
  • Free, public astronomy presentations in a bar in downtown Santa Barbara
  • UCSB Physics Circus September 2013–June 2018
  • Interactive physics demonstrations for local elementary and middle schools
  • UCSB Jazz Ensemble, bass trombone January 2014–June 2018
  • University of California Marching Band, trombone August 2008–May 2012
  • Student Director, Executive Committee 2011
  • Musical Activities Committee 2010
  • Director's Assistant 2009
  1. Talk: "3000 Photometrically Classified Transients from the Pan-STARRS1 Medium Deep Survey," Hot-wiring the Transient Universe VI, Evanston, IL, USA, August 2019
  2. Merging Visions: Exploring Compact-Object Binaries with Gravity and Light, Santa Barbara, CA, USA, June 2019
  3. Poster: "Finding SLSNe and TDEs in ZTF," Enabling Multi-Messenger Astrophysics Workshop, Baltimore, MD, USA, April 2019
  4. Poster: "Type Ibn supernovae may not all come from massive stars," STScI Spring Symposium, Baltimore, MD, USA, April 2019
  5. Talk: "A Type Ibn supernova in a brightest cluster galaxy," Pre-Filippenkopalooza Meeting, Santa Cruz, CA, USA, August 2018
  6. Talk: "Probing late-stage stellar evolution through robotic follow-up of nearby supernovae," 231st AAS Meeting, Oxon Hill, MD, USA, January 2018
  7. Talk [supernova workshop, invited]: "Type Ibn supernovae" and Talk: "Early blue excess from the Type Ia supernova 2017cbv," Southern Horizons in Time-Domain Astronomy (IAU Symposium 339), Stellenbosch, Western Cape, South Africa, November 2017
  8. Talk: "Las Cumbres Observatory: A global network of robotic telescopes for time-domain follow-up," Generation-GW: Diving into Gravitational Waves, St. Thomas, VI, USA, June 2017
  9. Talk: "Short-lived circumstellar interaction in a low-luminosity Type II supernova," 229th AAS Meeting, Grapevine, TX, USA, January 2017
  10. Talk: "Type Ibn supernovae have uniform light curves but two spectral subclasses," Supernovae Through the Ages, Hanga Roa, Easter Island, Chile, August 2016
  11. Talk: "Type Ibn supernovae: not a single class," 227th AAS Meeting, Kissimmee, FL, USA, January 2016
  12. Talk: "FLOYDS: A robotic spectrograph for the Faulkes Telescopes," Hot-wiring the Transient Universe IV, Santa Barbara, CA, USA, May 2015
  13. Poster: "Diversity in Type Ibn supernovae," 225th AAS Meeting, Seattle, WA, USA, January 2015
First Author
  1. G. Hosseinzadeh et al. 2019, "Follow-up of the neutron star bearing gravitational wave candidate events S190425z and S190426c with MMT and SOAR," ApJL, 880, L4
  2. G. Hosseinzadeh et al. 2019, "Type Ibn supernovae may not all come from massive stars," ApJL, 871, L9
  3. G. Hosseinzadeh et al. 2018, "Short-lived circumstellar interaction in the low-luminosity Type IIP SN 2016bkv," ApJ, 861, 63
  4. G. Hosseinzadeh et al. 2017, "Early blue excess from the Type Ia supernova 2017cbv and implications for its progenitor," ApJL, 845, L11
  5. G. Hosseinzadeh et al. 2017, "Type Ibn supernovae show photometric homogeneity and spectral diversity at maximum light," ApJ, 836, 158
Second or Third Author
  1. S. Gomez, G. Hosseinzadeh, et al. 2019, "A galaxy-targeted search for the optical counterpart of the candidate NS-BH merger S190814bv with Magellan," ApJL, 884, L2
  2. P. J. Brown, G. Hosseinzadeh, et al. 2018, "Red and reddened: ultraviolet through near-infrared observations of Type Ia supernova 2017erp," ApJ, 877, 152
  3. R. Dastidar, K. Misra, G. Hosseinzadeh et al. 2018, "SN 2015ba: a Type IIP supernova with a long plateau," MNRAS, 479, 2421
  4. F. Huang, X.-F. Wang, G. Hosseinzadeh et al. 2018, "SN 2016X: a Type II-P supernova with a signature of shock breakout from explosion of a massive red supergiant," MNRAS, 475, 3959
  5. I. Arcavi, G. Hosseinzadeh, et al. 2017, "Optical emission from a kilonova following a gravitational-wave-detected neutron-star merger," Nature, 551, 64
  6. I. Arcavi, C. McCully, G. Hosseinzadeh, et al. 2017, "Optical follow-up of gravitational-wave events with Las Cumbres Observatory," ApJL, 848, L33
  7. M. L. Graham, S. Kumar, G. Hosseinzadeh, et al. 2017, "Nebular-phase spectra of nearby Type Ia supernovae," MNRAS, 472, 3437
  8. I. Arcavi, G. Hosseinzadeh, et al. 2017, "Constraints on the progenitor of SN 2016gkg from its shock-cooling light curve," ApJL, 837, L2
  1. R. Dastidar et al. 2019, "SN 2015an: a normal luminosity Type II supernova with low expansion velocity at early phases," MNRAS, in press, arXiv:1909.10602
  2. K. A. Bostroem et al. 2019, "Discovery and rapid follow-up observations of the unusual Type II SN 2018ivc in NGC 1068," ApJ, submitted, arXiv:1909.07304
  3. A. Hajela et al. 2019, "Two years of non-thermal emission from the binary neutron star merger GW170817: rapid fading of the jet afterglow and first constraints on the kilonova fastest ejecta," ApJ, submitted, arXiv:1909.06393
  4. L. Tartaglia et al. 2019, "The long-lived Type IIn SN 2015da: infrared echoes and strong interaction within an extended massive shell," A&A, submitted, arXiv:1908.08580
  5. J. E. Andrews et al. 2019, "SN 2017gmr: An energetic Type II-P supernova with asymmetries," ApJ, submitted, arXiv:1907.01013
  6. B. Trakhtenbrot et al. 2019, "1ES 1927+654: an AGN caught changing look on a timescale of months," ApJ, 883, 94
  7. L. Galbany et al. 2019, "On the Ca-strong 1991bg-like Type Ia supernova 2016hnk: evidence for a Chandrasekhar-mass explosion," A&A, 630, 76
  8. S. Gomez et al. 2019, "SN 2016iet: the pulsational or pair instability explosion of a low metallicity massive CO core embedded in a dense hydrogen-poor circumstellar medium", ApJ, 881, 87
  9. A. Pastorello et al. 2019, "A luminous stellar outburst during a long-lasting eruptive phase first, and then SN IIn 2018cnf," A&A, 628, 93
  10. T. Szalai et al. 2019, "The Type II-P supernova 2017eaw: from explosion to nebular phase," ApJ, 876, 19
  11. Y. Yang et al. 2019, "The young and nearby normal Type Ia supernova 2018gv: UV-optical observations and the earliest spectropolarimetry," ApJ, submitted, arXiv:1903.10820
  12. N. Blagorodnova et al. 2019, "The broad absorption line tidal disruption event iPTF15af: optical and ultraviolet evolution," ApJ, 873, 92
  13. K. A. Bostroem et al. 2019, "Signatures of circumstellar interaction in the Type IIL supernova ASASSN-15oz," MNRAS, 485, 5120
  14. D. Xiang et al. 2019, "Observations of SN 2017ein reveal shock breakout emission and a massive progenitor star for a Type Ic supernova," ApJ, 871, 176
  15. B. Trakhtenbrot et al. 2019, "A new class of flares from accreting supermassive black holes," NatAs, 3, 242
  16. F. Taddia et al. 2019, "Analysis of broad-lined Type Ic supernovae from the (intermediate) Palomar Transient Factory," A&A, 621, A71
  17. J. Sollerman et al. 2019, "Late-time observations of the extraordinary Type II supernova iPTF14hls," A&A, 621, A30
  18. W. Li et al. 2019, "Photometric and spectroscopic properties of Type Ia supernova 2018oh with early excess emission from the Kepler 2 observations," ApJ, 870, 12
  19. G. Dimitriadis et al. 2019, "K2 observations of SN 2018oh reveal a two-component rising light curve for a Type Ia supernova," ApJ, 870, 1
  20. S. J. Prentice et al. 2019, "Investigating the properties of stripped-envelope supernovae; what are the implications for their progenitors?" MNRAS, 485, 1559
  21. J. P. Anderson et al. 2018, "A nearby superluminous supernova with a long pre-maximum 'plateau' and strong C II features," A&A, 620, A67
  22. C. Fremling et al. 2018, "Oxygen and helium in stripped-envelope supernovae," A&A, 618, 37
  23. Astropy Collaboration 2018, "The Astropy project: building an inclusive, open-science project and status of the v2.0 core package," AJ, 156, 123
  24. D. J. Sand et al. 2018, "Nebular spectroscopy of the 'blue bump' Type Ia supernova 2017cbv," ApJ, 863, 24
  25. Y.-Z. Cai et al., "AT 2017be – a new member of the class of intermediate-luminosity red transients," MNRAS, 480, 3424
  26. L. Li et al. 2018, "Optical observations of the 2002cx-like supernova 2014ek, and characterizations of SNe Iax," MNRAS, 478, 4575
  27. C. P. Gutiérrez et al. 2018, "Type II supernovae in low-luminosity host galaxies," MNRAS, 479, 3232
  28. S. J. Prentice et al. 2018, "SN 2016coi/ASASSN-16fp: An example of residual helium in a Type Ic supernova?" MNRAS, 478, 4162
  29. J. P. Anderson et al. 2018, "The lowest-metallicity Type II supernova from the highest mass red-supergiant progenitor," NatAs, 2, 574
  30. K. Maguire et al. 2018, "Using late-time optical and near-infrared spectra to constrain Type Ia supernova explosion properties," MNRAS, 477, 3567
  31. L. Tartaglia et al. 2018, "The early detection and follow-up of the highly obscured Type II supernova 2016ija/DLT17am," ApJ, 853, 62
  32. S. Bose et al. 2018, "Gaia17biu/SN 2017egm in NGC 3191: the closest hydrogen-poor superluminous supernova to date is in a 'normal', massive, metal-rich spiral galaxy," ApJ, 853, 57
  33. C. Inserra et al. 2018, "On the nature of hydrogen-rich superluminous supernovae," MNRAS, 475, 1046
  34. A. A. Miller et al. 2018, "Early observations of the Type Ia supernova iPTF16abc: evidence for strong ejecta mixing or interaction with diffuse material," ApJ, 852, 100
  35. IceCube Collaboration et al. 2017, "Multiwavelength follow-up of a rare IceCube neutrino multiplet," A&A, 607, A115
  36. I. Arcavi et al. 2017, "Energetic eruptions leading to a peculiar hydrogen-rich explosion of a massive star," Nature, 551, 210
  37. LIGO Scientific Collaboration and Virgo Collaboration et al. 2017, "A gravitational-wave standard siren measurement of the Hubble constant," Nature, 551, 85
  38. C. McCully et al. 2017, "The rapid reddening and featureless optical spectra of the optical counterpart of GW170817, AT 2017gfo, during the first four days," ApJL, 848, L32
  39. LIGO Scientific Collaboration and Virgo Collaboration et al. 2017, "Multi-messenger observations of a binary neutron star merger," ApJL, 848, L12
  40. L. Yan et al. 2017, "Hydrogen-poor superluminous supernovae with late-time H-alpha emission: three events from the Intermediate Palomar Transient Factory," ApJ, 848, 6
  41. N. Blagorodnova et al. 2017, "iPTF16fnl: a faint and fast tidal disruption event in an E+A galaxy," ApJ, 844, 46
  42. C. Barbarino et al. 2017, "LSQ14efd: observations of the cooling of a shock break-out event in a Type Ic supernova," MNRAS, 471, 2463
  43. W. Zheng et al. 2017, "Discovery and follow-up observations of the young Type Ia supernova 2016coj," ApJ, 841, 64
  44. M. L. Graham et al. 2017, "Clues to the nature of SN 2009ip - II. The continuing photometric and spectroscopic evolution to 1000 days," MNRAS, 469, 1559
  45. L. Tartaglia et al. 2017, "The progenitor and early evolution of the Type IIb SN 2016gkg," ApJL, 836, L12
  46. M. J. Darnley et al. 2016, "M31N 2008-12a - the remarkable recurrent nova in M31: pan-chromatic observations of the 2015 eruption," ApJ, 833, 149
  47. G. Leloudas et al. 2016, "The superluminous transient ASASSN-15lh as a tidal disruption event from a Kerr black hole," NatAs, 1, E2
  48. F. Huang et al. 2016, "Optical and ultraviolet observations of the very young Type IIP SN 2014cx in NGC 337," ApJ, 832, 139
  49. R. Cartier et al. 2017, "Early observations of the nearby Type Ia supernova SN 2015F," MNRAS, 464, 4476
  50. M. Nicholl et al. 2016, "Superluminous supernova SN 2015bn in the nebular phase: evidence for the engine-powered explosion of a stripped massive star," ApJL, 828, L18
  51. M. Nicholl et al. 2016, "SN 2015bn: a detailed multi-wavelength view of a nearby superluminous supernova," ApJ, 826, 39
  52. R. Ferretti et al. 2016, "Time-varying sodium absorption in the Type Ia supernova 2013gh," A&A, 592, A40
  53. G. Terreran et al. 2016, "The multifaceted Type II-L supernova 2014G from pre-maximum to nebular phase," MNRAS, 462, 137
  54. S. Valenti et al. 2016, "The diversity of Type II supernova versus the similarity in their progenitors," MNRAS, 495, 3939
  55. L. Tomasella et al. 2016, "Optical and near infrared observations of SN 2014ck: an outlier among the Type Iax supernovae," MNRAS, 459, 1018
  56. F. Taddia et al. 2016, "Long-rising Type II supernovae from Palomar Transient Factory and Caltech Core-Collapse Project," A&A, 588, A5
  57. A. Pastorello et al. 2015, "Massive stars exploding in a He-rich circumstellar medium – VII. The metamorphosis of ASASSN-15ed from Type Ibn to Type Ib supernova," MNRAS, 453, 3649
Plus 211 astronomical telegrams and circulars (132 as first author).