Koh completed a PhD titled The use of scaffolding in introductory technology skills instruction for pre-service teachers at the Indiana University Bloomington.
[1] From 2008 to 2015, Joh was based in the Nanyang Technological University National Institute of Education in Singapore.
Koh then joined the faculty of the Higher Education Development Centre at University of Otago, rising to full professor in 2024.
[2] Koh co-authored a book published in 2015 on how design thinking can be incorporated into education.
[3][2] Koh serves as a Senior Associate Editor of the Asia Pacific Education Researcher, and was an invited plenary speaker at a Centre for Research in International Education conference at the Auckland Institute of Studies.