A Hakka, Wu was born in the village of Ho Hau, Wu-hua (Province of Guangdong, Diocese of Kai-ying). Baptized in the village's parish church, he received his primary education there. He joined the diocesan minor seminary of Ka-ying for his secondary education in 1940 and was ordained in 1952.[2]
He was appointed the fifth Bishop of the Hong Kong Catholic Diocese by Pope Paul VI as successor to Bishop Peter Lei Wang-kei who had died on 23 July 1974. He arrived in Hong Kong and on 25 July was consecrated and installed as Bishop of the Hong Kong in the Cathedral of the Immaculate Conception in 1975.
After due preparation, he initiated a Diocesan Renewal Movement for priests, laity and religious. On 25 March 1985, he led a five-member delegation on a seven-day visit to Beijing and Shanghai, at the invitation of the National Bureau of Religious Affairs under the State Council of China. He was the first bishop of Hong Kong to visit the mainland China. Later on 21 January 1986, he led a seven-member delegation on a ten-day visit to Guangzhou and the eastern part of his home Province, Guangdong, at the invitation of the Bureau of Religious Affairs of that Province. This visit marked the first reunion with his 85-year-old mother, after a separation of 40 years.
After the Tiananmen Square protests of 1989, on 11 July 1989, he wrote a letter to all the bishops in the world, requesting them to appeal for justice, order and democracy in China.[3]
On 1 September 1991, Wu issued a pastoral letter that exhorting the faithful to give full support to the direct elections to the Legislative Council – the first time in the history of Hong Kong – on 15 September.[2] In 1999, he convoked the "Diocesan Synod" to meet the pastoral needs of the Third Millennium.
^ abLeung, Beatrice; Chan, Shunning (2003). Changing Church and State Relations in Hong Kong, 1950-2000. Hong Kong: Hong Kong University Press.
^Wu, John (October 1989). "March into the Bright Decade: Pastoral Exhortation of Cardinal John B. Wu on the Pastoral Commitment of the Catholic Diocese of Hong Kong". Catholic Information Service.