Right after Banzon's graduation from the University of the Philippines, he worked as an assistant instructor at the University of the Philippines College of Agriculture in 1930 and was later promoted to instructor in agricultural chemistry in the same college. Banzon later pursued graduate studies.[1]
Banzon later returned to the Philippines to work as an assistant professor in agricultural chemistry at the UP College of Agriculture. His teaching stint as an assistant professor ended in 1951. He later served as associate professor, associate chemist, and assistant head of the Department of Agricultural Chemistry from 1951 to 1955. Banzon received an aid for his study on the use of radioisotopes in agriculture in through an ICA Type A grant in 1956. In 1958, he was appointed as chief scientist of the Philippine Atomic Energy Commission. One of the highlights of Banzon's career was his tenure as the first director of the Philippine Atomic Research Center from 1960 to 1963. He was given a plaque of appreciation by the research center.[1]
Banzon resumed his career at the UP College of Agriculture, where he worked as professor and chairman of the department of agriculture chemistry from August 1, 1963, to March 24, 1970. He was the officer-in-charge of the division of food science and technology at UP Los Baños from March 25, 1970, to June 30, 1972. From July 1972 to March 1973, he served as a professor of food and science technology, and retired from the UP College of Agriculture at the end of his teaching stint in 1973.[1]
Banzon was frequently invited to attend scientific conferences abroad. He participated in the board of governors meeting of the International Atomic Energy Agency (IAEA) and in the general conference in Vienna, Austria, both held in 1960. In October 1981, he was an attendee of the Fourth Japan Conference on Radioisotopes held in Kyoto, Japan. Banzon also went to Bangkok, Thailand to attend the IAEA's Study Group Meeting on the Utilization of Research Reactors held from December 17 to 21, 1962. He was also part of the Philippine delegation to attend the 11th Pacific Science Congress held in Tokyo, Japan and 12th Pacific Science Congress in Canberra, Australia held in August 1966 and August 1971 respectively.[1]
He also held the position of chairman at the division of chemical and pharmaceutical science of the National Research Council of the Philippines and was a member of the Chemical Society of the Philippines' board of directors, from 1972 to 1973. Banzon was also member of the Society for the Advancement of Research, the Sigma Xi of Iowa State University and the Radioisotopes Society of the Philippines. Banzon was also the president of the Gamma Sigma Delta Honor Society of Agriculture, UP Los Baños Chapter.[1]
He was named as one of the members of the National Academy of Science and Technology (NAST) along with Clare Baltazar and Armando Dalisay on July 9, 1981. From 1985 to 1988, he was a member of the NAST executive council.[1]
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