a filipino composer who was aknowledged as the "dean of filipino movie composers and musical derectors" he is the composer of the nationalistic song "bayan ko"​

The composer described in the question is Contancio de Guzman.

Explanation:

Constancio Conseca de Guzman was born in 1903 in the Philippines. He died in 1982. Guzman was raised in Manilla, where he had the chance to study composition and piano. He eventually became the music director of several movie production companies, and was acknowledged as the "dean of Filipino movie composers and musical directors." Guzman composed the melody to accompany the poem "Bayan Ko", originally "Nuestra Patria", by Jose Corazon de Jesus.

answer; (i-o) psychologist