The DepEd-OERs started when Mark Anthony Sy, a former Grade School Teacher and Institutional Educational Technology Liaison Officer in La Salle-Green Hills, joined the department on April 16, 2018. Immediately, under Usec. Alain Del Pascua’s order, he started implementing the program with the help of 13 DepEd personnel, some of whom are teachers. The team grew to a larger number that is called as OER National Core Leaders.