Adj Asst Prof Timothy Koh is a Senior Consultant with the Department of Renal Medicine at Tan Tock Seng Hospital (TTSH). He is also an Adjunct Assistant Professor with the Yong Loo Lin and Lee Kong Chian Schools of Medicine.

Adj Asst Prof Koh completed his undergraduate medical training at the National University of Singapore in 2003 and obtained his Membership of the Royal College of Physicians (United Kingdom) and Master of Medicine (Internal Medicine) in 2008. He completed his advanced specialty training in Renal Medicine in 2012. Between 2014 – 2015, he underwent his fellowship training under the Ministry of Health's Health Manpower Development Plan in Home Haemodialysis under the University Health Network/Toronto General Hospital in Toronto. His areas of interest are in Haemodialysis, General Nephrology and Quality Improvement.

Adj Asst Prof Koh is active in both undergraduate and postgraduate medical education and has been appointed the Programme Director for the NHG Health Renal Medicine Residency Programme since 2023. He has also contributed to publications in peer reviewed journals and book chapters.