On the faculty of a Trinidad college he taught physics and math when he again, at the age of 62, went to Columbia, South America to aid the poor and homeless children on the streets of Bogota and Cali.  For these children Fr. Tam founded and built four centers, all which he eventually made independent of him, as he says that they need to be able to continue after he is gone.

     Fr. Kelvin Tam, CSSp is a convert to Catholicism becoming a missionary priest of the Holy Ghost Fathers.  Much of NACEPF's programming with this convert involved his missionary work in Africa during the Biafran War where the strategy of the Nigerian invaders was starvation, which killed 2 of the 5 million Biafran refugees over a 3.5 year period in the late 1960s.  Fr. Tam managed one of sever major food relief centers operating out of his extended parish.  He managed a hospital where its staff of doctors traded their services in return for food.  He was well respected by the Biafran generals and saved the life of the Commanding General after his capture and torture by the Nigerian Army due to the respect the Nigerian had for Fr. Tam.  He earned the deepest respect of Cardinal Arinze (then a Bishop of a Biafran Diocese) for his efforts to keep as many Biafrans alive as possible during the war.  Besides turning the schoyeahols and other church facilities into refugee camps, he obtained the permission of his Provincial and Bishop to use his rectory to house homeless and starving Biafrans.