Saint Mary’s University traces its roots back to the dream and initiative of Bishop Constant Jurgens, CICM, one of the earliest CICM missionaries to arrive in the Philippines. In pursuit of his dream to establish a school for the Christian education of the parishioners’ children, he purchased a lot and some materials. Upon his recall to Europe, his successor, Rev. Fr. Achilles de Gryse, CICM, saw his dream through. Their efforts resulted in the inauguration of the St. Mary’s Elementary School in June 1928. The High School Department was opened in 1934 under Rev. Fr. Godfrey Lambrecht, CICM. The Senior High School opened in 2016.

In 1947, Fr. Lambrecht established the College Department with the offering of Associate in Arts, Bachelor of Science in Education, Bachelor of Arts, and Junior Normal
course (Elementary Teacher’s Certificate). Gradually, the course offerings expanded with a Bachelor of Science in Commerce, including a major in Accounting in 1951, a Bachelor of Science in Civil Engineering in 1955, and a Graduate School in 1962. Through the years, Institutes, Colleges,/Schools were established with more program offerings. Many academic programs opened, including Accountancy, Business, Computing Sciences, Information Technology, Geodetic Engineering, Electrical Engineering, Electronics Engineering, Architecture, Nursing, Pharmacy, Medical Laboratory Sciences, Public Administration, Criminology, Political Science, Psychology, Criminology, and Law.

Rapid campus expansion started in 1968 with the purchase of the 6.5-hectare campus along the Magat River and the construction of the academic building named in honor of Rev.
Godfrey Lambrecht, CICM. The college department moved from the old campus, at the back of the Cathedral, to its present site in 1969, two years after the ownership and management were turned over to the CICM. Construction of other buildings continued over the years, thus providing more learning space for the students, such as the gymnasium, library, Gomburza, and De Gryse buildings.

In 1994, the University Building, now Constant Jurgens building, was constructed to commemorate the elevation of Saint Mary’s College to university status, with Rev. Fr. John Van Bauwel, CICM, as the first University President. With the installation of Rev. Fr. Jesse M. Hechanova, CICM, as the second University President in 1998, more edifices were built for different purposes like the Institute of Science and Mathematics Building (now Center for Natural Sciences), St. Joseph’s Inn, Hantson Building, Sacred Heart Center, High School Building (Phase I), Balai na Alumni, Jubilee Library Building, and SMU FEA Multi-Purpose Cooperative Building (now replaced by JVD building).

The year 2005 saw the installation of Rev. Fr. Manuel D. Valencia, CICM, as the third University President, and with him at the helm, two four-storey buildings were constructed, one in commemoration of the CICM centenary in the Philippines (Florentina Bldg in the Junior High School) and the other named after the CICM founder Rev. Fr. Theophile Verbist (Apo Pilo Bldg).

As the University’s course offerings increased and the population expanded, new buildings were constructed to cater to the needs of the students and the ever-changing
thrusts of education and technology. The construction of the Engineering Laboratory Building, now Renato Seargent Building, in August 2011 is not only a testament to Rev. Fr.
Renillo H. Sta. Ana’s CICM commitment to the CICM educational apostolate as the fourth University President (installed in 2010) and a grateful testament to the dedication of Rev. Fr. Renato Sergeant, CICM, who generously served the SMU community for 24 years. In 2012, the Mary Seat of Wisdom Chapel and the St. Pedro Calungsod Hall were inaugurated. In 2016, the Georges De Busschere Building was inaugurated.

In 2016, Saint Mary’s University Senior High School (SMUSHS) came into existence through the enactment of Republic Act No. 10533 otherwise known as the “Enhanced Basic
Education Act of 2013.” By virtue of this law, the K to 12 Program was implemented by the Department of Education to enhance the basic education system in the Philippines by
improving its curriculum and by increasing the number of years for basic education, hence, the additional two years of senior high school.

SMUSHS welcomed its first batch of Grade 11 students in School Year 2016-2017. Situated at the SMU college campus, the Senior High School initially occupied the newly constructed and inaugurated academic building named in honor of Rev. Fr. Joseph Van Den Daelen, CICM or the JVD Building located near the University’s Main Gate. Since its opening in 2016, SMU Senior High School has been a home to thousands of young and promising students coming from the different provinces of the Cagayan Valley and neighboring regions. It offers the Academic Track, Technical- Vocational and Livelihood Track and Arts and Design Track. Under the Academic Track are four strands namely Science, Technology, Engineering, and Mathematics (STEM) Strand, Humanities and Social Sciences (HumSS) Strand, and Accountancy, Business, and Management (ABM) Strand, and General Academic Strand (GAS). Under the TVL Track, two strands are offered: Home Economics (HE) Strand and Information and Communications Technology (ICT) Strand. It also offers the Arts and Design (AD) Track.

Dr. Henry C. Navarro served as the first Principal with Mr. Melencio G. Bernardino Jr. as Assistant Principal. In School Year 2017-2018, the Grade 11 classes remained at JVD
Building while the Grade 12 classes occupied the newly constructed building near Gate 2 named after Rev. Fr. Antonio Tanchoco, CICM or the AT Building. The distance between the two Senior High School buildings caused some issues not only on the movement of teachers from one building to the other but also on the supervision of instruction. In June 2018, the administration has decided to house the Grade 11 students at the Rev. Fr. George Hantson, CICM Building or H Building which is adjacent the AT Building. Consequently, the School of Accountancy and Business who was then occupying H Building moved to the JVD Building.

During the first school year, coordinators were assigned by track/strand. Dr. Erlinda Españo served as Coordinator of Accountancy, Business, and Management (ABM) Strand,
Miss Marites B. Querol for Humanities and Social Sciences (HUMSS) Strand and Religious Education, Miss Shiellah Mae Barsicula for Science, Technology, Engineering and
Mathematics (STEM) Strand, and Mr. Adonis V. Garces for Technical-Vocational and Livelihood (TVL) and Arts and Design Tracks. Liturgical and other spiritual activities were
done in coordination with the Campus Ministry. In SY 2017-2018, full-time faculty of the Senior High School were appointed as academic coordinators for the different learning areas. Also, the school appointed coordinators for Student Activities, for Campus Ministry and for Community Extension.

In April 2018, Mr. Melencio G. Bernardino Jr. was appointed Officer-in-charge of the Senior High School and was eventually appointed as Principal in SY 2018-2019.

Since 2016, SMUSHS has bagged several awards in various competitions in the fields of academics, research, sports, and journalism in local, regional and national levels. In
December 2019, SMU Senior HS together with SMU Junior High School was adjudged as Champion for Best Private School of the Gawad KALASAG in Region 2 in recognition of
its efforts and commitment in supporting and initiating activities geared towards building a learning environment by focusing on creating awareness and involvement of students as
well as other stakeholders in achieving the country’s vision of safer, adaptive and disaster resilient Filipino communities. In the same year, after a series of assessment and field
validation by the Gawad Kalamidad at Sakuna Labanan, Sariling Galing ang Kaligtasan (KALASAG) national selection committee, SMU High School was declared as the National
Champion- Private High School Category in the 21st National Gawad KALASAG, besting other private schools in the entire Philippines, during the awarding ceremony held at the
Philippine International Convention Center (PICC) Complex, Manila on December 6, 2019.The school received a plaque of recognition and a cash prize of Php 300, 000.00.

In 2016, some teachers were selected to be trained as national trainers for the annualIn-service Training of Senior High School Teachers organized by the Private Education
Assistance Committee (PEAC). Since then, they have been serving as trainers in the different regions of the country. A number of faculty members have also presented their research papers within the country and even abroad.

In March 2020, the government mandated a national lockdown in response to the burgeoning cases of Corona Virus Disease 2019 (COVID-19) which has eventually become a
global epidemic. Consequently, for the remaining months of SY 2019-2020, the teaching and learning had to continue virtually. Teachers and learners communicated through SMS, call and messenger. For the first time, the end-of-school year rites were not carried out the traditional way. Instead, the school has organized virtual Recognition Program and
Commencement Exercises streamed via the Senior High School’s official Facebook page on August 23, 2020.

Amidst the pandemic, education had to continue in SY 2020-2021. For the first time, distance learning was implemented for the entire school year and everything was done
virtually. Most of the time, the teachers had to work from home while the administration and staff had to report on certain days and work from home on some days. Inspired by mission and driven by excellence, SMU Senior High School has developed an innovative program to make teaching and learning possible, thus, the SMU Senior High School Multi-modality Learning Program (SMLP). This is a flexible distance learning modality which featured the use of teacher-made instructional videos and the textbooks as the main reference materials. Monthly, the parents/ guardians had to come to school to have the learning packets saved in their flash drives or other storage device. Teacher-student and student-student interactions were made possible through the creation of class Group Chat for Academic Purposes and the use of zoom or Google meet for conferencing or virtual meeting. Written summative assessments were initially given using varied software such as Google Forms. Requirements were submitted through email or messenger. Eventually, the school has developed a customized Learning Management System (LMS) dubbed as Blended Learning Environment System of SMU (BLESSMU). This system has facilitated the sending of learning packets, administration of written tests and submission of requirements. Faculty meetings, recollections, Eucharistic celebrations, rosary praying, trainings and seminars were done via Google Meet or Zoom. The school year culminated through the virtual Recognition Program and Commencement Exercises streamed via the Senior High School’s official Facebook page on July 3 and 4, 2021 respectively. In the following School Year 2021-2022, the SMLP has evolved in response to the
feedbacks of students, parents/ guardians and teachers on the maiden implementation of the program in the previous school year and the improving level of internet connectivity
among teachers and learners, hence, the Enhanced SMU Senior High School Multi-modality Learning Program was implemented. Teacher-made videos and textbooks remained to be the main teaching-learning materials. Seminar-workshops were held to enhance the knowledge and skills of teachers in producing instructional videos. As an enhancement,
online synchronous sessions were conducted at the end of each class period which provided the subject teachers and the learners an opportunity for virtual interaction, clarification, and monitoring of learning activities. Finally, the government has allowed the conduct of end-of- school year rites face-to-face. On June 8, 2022, the 6th Recognition Program in SMU Senior High School was conducted the traditional way at the Fr. Tonus gymnasium. On June 9 and 10, the Baccalaureate Mass and Commencement Exercises for STEM and for ABM, HUMSS, TVL-HE and ICT and Arts and Design respectively were held face to face at the Fr. Tonus gymnasium.

In SY 2022-2023, Saint Mary’s University, in its pursuit to provide quality programs and services to its stakeholders, obtained its International Organization for Standardization
(ISO) 9001:2015 certification. In the same year, SMUSHS welcomed back its students in campus pursuant to DepEd Order No. 34 s. 2022 which mandated the return of full face-to-face learning modality in all public and private schools. Moreover, the long-planned Preliminary Visit by the Philippine Accrediting Association of Schools, Colleges, and
Universities (PAASCU) was finally realized. SMUSHS prides itself as the first Senior High School in Nueva Vizcaya to be accredited by the PAASCU after it underwent the rigorous
blended Preliminary Visit on March 16-17, 2023. The accreditors conducted onsite and virtual review of documents, class observations, individual and group interviews of
administrators, faculty and staff, students, parents, alumni, and the recipients of the different community extension services of SMU SHS. The new PAASCU instrument for Basic Education accreditation was used. In June 2023, SMUSHS held its first-ever Graduation Ball to celebrate the achievements and successes of the graduating students.

To enhance the relevance of the curriculum, Aralinks Coding Education (ACE) has been integrated in the curriculum beginning August 29, 2023. In April 2024, CCTV cameras have been installed in both the Antonio Tanchoco (AT) Building and Hantson (H) Building to enhance safety and security in the Senior High School vicinity. The installation aimed to create a safer environment by deterring potential security incidents and providing footage for any necessary investigations. This initiative reflects SMU’s commitment to maintaining a secure and well-supervised campus.

In time for the opening of SY 2024-2025, air conditioning units have been installed in the Senior High School classrooms in July 2024 to improve the learning environment for
students and teachers. This upgrade aims to provide a comfortable atmosphere, especially during warmer months, enhancing focus and productivity. The installation was strategically planned to ensure minimal disruption to daily classes and school activities. SMU’s commitment to improving facilities reflects its dedication to student welfare and academic excellence.

To date, SMUSHS has graduated six batches: two face-to-face pre-pandemic, two virtual graduation ceremonies, and recently two face-to-face graduation ceremonies as the
restrictions of the pandemic finally became more relaxed. A name stated in Latin is given to each batch of students. The first batch of graduates, Class of 2018, was named Pax Christi or Peace of Christ, Class of 2019 as Fides in Christo or Faith in Christ, Class of 2020 as Spes in Christo or Hope in Christ, Class of 2021 as Caritas in Christo or Charity in Christ, Class of 2022 as Obedientia Christi or Obedience of Christ, and the latest, Class of 2023 as Amor Christi or Love of Christ.