Callum is an expert in high-redshift galaxy observations with ground- and space-based telescopes, and is particularly interested in the interplay between the environment and properties of galaxies in the very early Universe. He received his PhD in 2024 from the University of Cambridge under the supervision of Debora Sijacki and Nicolas Laporte. Since November 2024 he has been a postdoctoral fellow in the "Galaxy Build-up at Cosmic Dawn" group.