Bishop Stephen Lee Bun Sang, was born on 10 November 1956 in Hong Kong. He was baptized as a Catholic on 24 July 1976 at St. Margaret's Church in Hong Kong. He then went to England for his university studies in architecture for 5 years. In 1978, he joined Opus Dei Prelature in London as Numeracy member. He returned to Hong Kong in 1982 and started to work as an architect. In 1984, he entered the international seminary of Opus Dei Prelature in Rome for is studies in Philosophy and Theology. He then continued his further ecclesiastical studies at the University of Navarra, Pamplona, Spain and obtained the Doctorate in Canon Law. He was ordained priest in Spain on 20 August 1988. He returned to Hong Kong in 1989 and started his pastoral work as chaplain to some Opus Dei Centers and schools. He was appointed in the same year by the Bishop of Hong Kong as the Defender of the Bond in the Diocesan Tribunal of Hong Kong. In 1994, he became the Supervisor of Tak Sun School of Hong Kong.
In 2012, he was appointed by the Prelate of Opus Dei Prelature as the regional Vicar for East Asia Region. At the same time, he has continued his pastoral work in preaching monthly recollections and retreats, and in giving Catholic doctrine classes for the Prelature, the Diocese, the parishes and different religious communities. He was appointed by Pope Francis as Auxiliary Bishop of Hong Kong on 11July 2014 and was ordained bishop on 30 August 2014. He has been in charge of formation of laity, schools, communications, liturgy, and building developments in the Diocese of Hong Kong. After the resignation form Office of Bishop José Lai Hung-Sang, on 16 January 2016 he was appointed by Pope Francis as a new Bishop of Macau.