In 1964, Brother Patrick, together with Brother Thomas Favier, was posted to St. Joseph's College, Hong Kong and stayed with the school till 1990. He was the Principal of St. Joseph's College, Hong Kong from 1974 to 1986. In 1975 he presided over the Centenary celebrations both of St. Joseph’s College and of the arrival of the Brothers in Hong Kong. When he stepped down as principal he followed a two year course in Cantonese at the Chinese University.
In 1990 he was transferred to La Salle College, Kowloon where he did some teaching and was Director of the Brother’s Community. In 1998, he became the Ninth Principal of La Salle College. In the same year, the College was recognized as one of the 114 schools that were qualified to continue with the use of English as the medium of instruction (EMI). Dennis C.Y. Ho (2002) of the UK Chapter, LSCOBA shared with us: “In my final two years at La Salle College, Brother Patrick became the principal as well as the supervisor. He was a friendly leader but also a busy man. He chaired the Third Asia Pacific Lasallian Educators’ Congress (APLEC) held in Hong Kong in 1998. He wrote many Catholic articles. He introduced “Day by Day” – extracts from the writings of St. John Baptist de La Salle to our classes. It contains spiritual formation, classroom behaviour, stories of saints, biblical quotes, etc. It was a pity that I never had the opportunity of being taught by any Christian Brothers.”
In 1999, Brother Patrick set up the Information Technology Management Team. The LAN of ED3 and Multi-media Learning Centre were completed in 2002.
Before the turn of the millennium, Brother Patrick organized a Millennium Photo Taking on 21st December 1999 at La Salle. A total of 690 students stood on the school field and formed the characters of LSC 2000.
The year 2000 was fruitful. Brother Patrick led the celebration of the 125th Anniversary of the coming of the De La Salle Brothers to Hong Kong and the 100th Anniversary of the Canonization of St. John Baptist de La Salle and the 50th Anniversary of Declaration of St. John Baptist de La Salle as the “Patron of all Teachers”. On 17th April 2000, the Jubilee Feast Day Mass was held on the school field of La Salle College with Bishop Joseph Zen Ze-Kiun S.D.B. as the chief celebrant.
The year 2000 also saw the La Salle boys shine in the HKCEE 2000 public examination. They scored a record of 477 A's. In the same year Brother Patrick launched the redevelopment of La Salle Primary school. The new school building was completed in 2002 and possesses a large auditorium cum gymnasium, a 25-M indoor swimming pool, a striking chapel and a spacious playground.
Upon his retirement as school principal in 2000, he concentrates, as Sector leader, on co-ordinating the activities of the Hong Kong Lasallian Family. He also has a large interest in preserving Lasallian heritage. In addition, he goes in for publications of a religious and Lasallian character. For the last several years, and with the assistance of Paul Tam, he produces a Hong Kong Lasallian Family magazine entitled “The Gateway.” It is issued in both electronic and hard copy formats. In addition, he is Supervisor of La Salle College and La Salle Primary School and a school manager of De La Salle Secondary School, N.T., Chan Sui Ki (La Salle) College and Chan Sui Ki (La Salle) Primary School. As he says himself, all this activity keeps him out of mischief.