Loh was first appointed to the
Supreme Court of Singapore as a
Judicial Commissioner on 1 September 2009. On 1 June 2010, he was elevated to the position of
High Court Judge. In December 2017, his term was extended by three years by president
Halimah Yacob, and he was sworn in on 4 January 2018. He has occasionally sat on the
Court of Appeal of Singapore during periods with a high caseload. Loh is in charge of the
Singapore International Commercial Court (SICC), and chairs both the SICC Development Committee and the SICC Rules Committee. He also chairs the Personal Injury (Claims Assessment) Review Committee and the Professional Training of Lawyers group. Loh was responsible for convicting
Alan Shadrake in the case of
Shadrake v Attorney-General in 2011. Shadrake had been charged with the
offence of scandalizing the court in Singapore with his book
Once a Jolly Hangman: Singapore Justice in the Dock. Loh clarified and contextualized the law throughout the case and judgement.
Supreme Court of Fiji On 15 August 2018, Loh was appointed to the non-resident panel of the
Supreme Court of Fiji for three years. In this position, he sits alongside the Supreme Court Judges of Fiji to hear civil and commercial cases for a period of three weeks per year. The move was seen by
Chief Justice Sundaresh Menon as "contributing to the development of the
rule of law internationally". ==Other work==