Curriculum Vitae

Dr Joris Witstok

For references or a more detailed version of my CV, please contact me directly.

Research interests

Early Galaxy Formation and Evolution; First Galaxies; Reionisation of the Universe; Enrichment of Metals and Dust


2018-2022: Ph.D. in Astrophysics (University of Cambridge)

Ph.D. in Physics at Sidney Sussex College, conducting research in the Galaxy Formation and Evolution group (led by Prof Roberto Maiolino), and as member of the \( \textit{JWST} \)/NIRSpec GTO team. Thesis title: \( \textit{Spectroscopic studies of star-forming galaxies and the intergalactic medium in the early Universe} \). Supervisors: Dr Renske Smit and Prof Roberto Maiolino.

2017-2018: Master of Advanced Study (University of Cambridge)

Graduated with distinguished performance (Distinction, 85/100) in the Master of Advanced Study (MASt) in Astrophysics at Sidney Sussex College, University of Cambridge. Supervisors: Dr Ewald Puchwein, Dr Girish Kulkarni, and Prof Martin Haehnelt. Elected courses: Formation of Structure in the Universe, Quantum Field Theory, Cosmology, Extrasolar Planets: Atmospheres and Interiors, Dynamics of Astrophysical Discs.

2014-2017: Double Bachelor of Science (University of Leiden)

Graduated \( \textit{cum laude} \) both in Physics and Astronomy (a double bachelor degree), combined with Honours College (8.9 out of 10 average).

First-author publications

Successful observing proposals

  • 2022: Principal Investigator of ALMA program 2022.1.00925.S: \( \textit{Cold Dust at Cosmic Dawn: uncovering a cool dust reservoir in the Epoch of Reionization} \)
  • 2022: Co-Investigator of ALMA program 2022.1.01384.S (PI: Fudamoto): \( \textit{Probing origins of the [CII] emission in the Epoch of Reionization} \)
  • 2022: Co-Investigator of ALMA program 2022.1.01131.S (PI: Smit): \( \textit{Resolving disks and mergers in the Epoch of Reionization} \)
  • 2022: Co-Investigator of ALMA program 2021.1.00722.S (PI: Schouws): \( \textit{Exploring the ISM conditions of UV-selected galaxies in the Epoch of Reionization by Surveying [OIII], [CII], and Dust} \)
  • 2021: Principal Investigator of \( \textit{Hubble Space Telescope} \) program ID 16506: \( \textit{Imaging the sites of star formation at sub-kiloparsec scales in the Epoch of Reionization} \)
  • 2018: Co-Investigator of ESO observing runs 0103.B-0928(A) & 0103.B-0928(B) (PI: Smit): \( \textit{Rest-frame UV diagnostics of star-forming galaxies in an extreme protocluster environment at } z \sim 3 \)


  • 2022: Scuola Normale Superiore (Pisa, Italy)
  • 2022: Metallicity evolution (Catania, Italy)
  • 2022: Ringberg meeting (Ringberg, Germany)
  • 2022: NAM (Warwick, United Kingdom)
  • 2022: EAS (Valencia, Spain)
  • 2022: DAWN (Virtual)
  • 2022: MAYA (Virtual)
  • 2021: SAZERAC SIP (Virtual)
  • 2021: Wednesday seminar (Cambridge, United Kingdom)
  • 2021: NAM (Virtual)
  • 2021: EAS (Virtual)
  • 2021: SAZERAC 2.0 (Virtual)
  • 2020: Wednesday seminar (Cambridge, United Kingdom)
  • 2020: EAS (Virtual)
  • 2019: Advanced school (Sao P\( \mathrm{\tilde{a}} \)ulo, Brazil)
  • 2019: Kavli Seminar (Cambridge, United Kingdom)
  • 2019: Cosmic Web conference (Spineto, Italy)



Teaching assistant for second, third, and fourth year courses Introduction to Computing, Formation of Structure in the Universe, and the Physics of Cosmology, supervising small groups between two to six students.


Teaching assistant in the first and second year courses Introduction to Astrophysics and Introduction to Solid State Physics, being in charge of supervision sessions, correcting homework, and grading exams.


2020: University of Cambridge

Gave an outreach talk for the Institute of Astronomy’s Public Open Evening (see also the YouTube channel of the IoA).

2015-2017: University of Leiden

PR ambassador and member of the PR team as a representative of the Bachelor degree of Physics.

2015-2017: Old Observatory (University of Leiden)

Custodian in the visitor centre of the Old Observatory in Leiden, and tour guide in the Old Observatory, displaying the historical building and its original telescopes to groups.