Alexander Campbell


I used to be a category theorist. Now I spend most of my time learning Ancient Greek.
I was a member of the Centre of Australian Category Theory (CoACT) at Macquarie University, where I was a postgraduate student (2013--2016), a Postdoctoral Research Fellow (2017--2019), and a Research Officer (2020--2021). In 2021, I held Postdoctoral Fellowships in the Mathematical Sciences Institute at the Australian National University and in the School of Mathematics and Statistics at the University of Melbourne. In 2020, I was the Viterbi Endowed Postdoctoral Fellow in the Higher Categories and Categorification program at MSRI. I was an undergraduate student (2009--2012) at the University of Sydney, where I graduated with First Class Honours and the University Medal in Pure Mathematics, and where I am currently studying for a degree in Classics.


  1. Joyal's cylinder conjecture, Advances in Mathematics 389 (2021), 107895, 40 pp.
  2. A homotopy coherent cellular nerve for bicategories, Advances in Mathematics 368 (2020), 107138, 67 pp.
  3. A counterexample in quasi-category theory, Proceedings of the American Mathematical Society 148 (2020), no. 1, 37--40.
  4. On truncated quasi-categories (with Edoardo Lanari), Cahiers Topol. Géom. Différ. Catég. 61 (2020), no. 2, 154--207.
  5. How strict is strictification?, Journal of Pure and Applied Algebra 223 (2019), no. 7, 2948--2976.
  6. Skew-enriched categories, Applied Categorical Structures 26 (2018), no. 3, 597--615.
  7. A higher categorical approach to Giraud's non-abelian cohomology, PhD thesis, Macquarie University, 2016. Supervisor: Ross Street.
  8. Linear algebra via complex analysis (with Daniel Daners), The American Mathematical Monthly 120 (2013), no. 10, 877--892.


See here for a list of my talks at the Australian Category Seminar.



Blog post: An exegesis of Yoneda structures, written for the Kan Extension Seminar.


I was a co-organiser with Emily Riehl and Brendan Fong of the Kan Extension Seminar II, an online graduate reading course in category theory.

Other material

AustMS Lift-Off Fellowship Report.