1947-The proposal to establish Li Sun High was dismissed due to lack of a suitable site and funds.
1955-Extensive renovations were carried out at Kuo Chuan High School but it failed to attract sufficient number of students due to its remote location.
1960-The Synod passed the resolution to start Li Sun High using the Ming Xin Primary School premises at Upper Serangoon Road.
1965-Li Sun High School, named after Rev Alan Anderson, opened its doors to the first batch of Secondary 1 pupils. In March, Li Sun High School became a full government-aided school. Mr Chou Chu Shen was the first Principal.
1978-Li Sun High School came under the management of Bethel Presbyterian Church. In March, Mr Lim Lak Ching took over as the 2nd Principal of the school.
1979-Mr Chen Ying Foo covered duties of the principal as Mr Lim went on course under the Innotech scheme in the Philippines.
1980-Mr Lian Sek Lin took over the 3rd Principal of the school.
1981-The new site at Ang Mo Kio Avenue 6 was endorsed by the Synod. At the same time, the latter decided to rename the school – Presbyterian High School.
1983-The new site at Ang Mo Kio Avenue 6 was endorsed by the Synod. At the same time, the latter decided to rename the school – Presbyterian High School.
1984- Official opening of the school was held, officiated by Mr Lau Ping Sum.
1989-In December, Dr David Wang Mei Hsiong took over the 4th Principal of the school.
1994-The school badge was re-designed to incorporate the school motto – Aflame For Truth. The school shirt was re-designed to make it distinct from other schools.
1995-In December, Mrs Serene Pang took over the 5th Principal of the school.
1996-PHS 21, with its 4 functional committees, Organisation Review, WITs & ESSS, Quality Service and Staff Well-Being, was introduced with the purpose of engineering a mindset change to prepare the school for the new millennium.
1997-The proposal to rebuild the school was accepted by the Management Board and the Presbyterian Synod. 3 core values, namely Prudence, Humility and Steadfastness were identified .
1998-The new school vision and mission were crafted. The school set up the Parent Support Group.
2000-The school re-building programme commenced. The school obtained its first Sustained Achievement Award for Uniformed Groups. Three engines of growth were conceptualised. The consortium concept was formed to promote better teamwork and sharing among the teaching staff and for better pastoral care of students.
2001- PHS 8 core values (FITTSHIP) were crafted.
2002-A Homecoming ceremeony was held and the 3 hectare land was occupied. The school was accorded the PDS and ISO-2000 certifications. The PHS alumni was formed in March. In December, Mrs Carolin Tan took over as the 6th Principal of PHS.
2004-Official Opening of the new campus was officiated by the then Acting Minister for Education, Mr Tharman Shanmugaratnam.
2005-The school celebrated its 40th Anniversary of the school, officiated by Rev Lee Huai Kwang. The school was recognised as niche programme school for Uniformed Groups.
2006- The school obtained Development Award for Character Development and National Education.
2007-The school was recognised as double niche programme school for Uniformed Groups and Volleyball. The school started to offer Economics as an ‘O’ level subject. The school obtained its first Sustained Achievement Award for Sports. The school had its first External Validation conducted by MOE.
2008-The school was accorded the BE Niche Standard (People) certification. In December, Mr Lim Yan Hock took over as the 7th Principal of PHS.
2009-Ground breaking ceremony of the Indoor Sports Hall was officated by Rt Rev Phua Chee Seng, Moderator of The Presbyterian Church of Singapore. The school was re-validated for Character Development Award and National Education Award and obtained Development Awards for both. The school started to offer Physical Education as an ‘O’ level subject.
2010-45th Anniversary of the school and dedication of the Indoor Sports Hall was officiated by Rt Rev Phua Chee Seng, Moderator of The Presbyterian Church of Singapore. The school obtained its first Sustained Achievement Award for Aesthetics.
Sourced from official site of Presbyterian High school.