Adj A/Prof Koh received her undergraduate medical degree, Master of Medicine (Internal Medicine) at the National University of Singapore and Membership at the Royal College of Physicians in the United Kingdom. She subsequently completed her Rheumatology training in Canada under the Ministry of Health's Manpower Development Plan (HMDP). She is a Fellow of the Academy of Medicine Singapore and a certified specialist in Rheumatology.

Adj A/Prof Koh Ee Tzun is currently the Senior Consultant at Tan Tock Seng Hospital and holds teaching appointments as Adjunct Associate Professor at the Lee Kong Chian School of Medicine (Nanyang Technological University of Singapore) and Clinical Senior Lecturer at the Yong Loo Lin School of Medicine (National University of Singapore).

She led the department's rheumatoid arthritis registry, funded previously by the NHG Health and is a collaborator in several rheumatoid arthritis research projects. She also participated previously as principal investigator in several drug trials for rheumatoid arthritis and has spoken in public forums on rheumatology topics.

Her research interests include epidemiology and outcomes of rheumatoid arthritis and inflammatory arthritis.