Ng began to train for Christian ministry, and, in 1985, he graduated Bachelor of Divinity from Seminari Teologi Malaysia (STM). He was ordained deacon in June of that year. Subsequently, he was ordained priest in February of the following year. He was awarded a further Master of Divinity degree from STM in 1989.
On 2 September 2015, Ng was elected to become 5th Archbishop of the Church of the Province of South East Asia by an Extraordinary General Meeting of the church's Synod meeting in Sandakan, Sabah, Malaysia. He began his four-year term of office on the 22 February 2016, succeeding Archbishop Bolly Lapok, and ended in February 2020.[1] He will continue to serve as Bishop of West Malaysia until his retirement in November 2020.[5]
Ng's memoir From Village to Village recounts his fifteen years of experience working with Anglican Village Ministries (AVM), which he founded in 1993.