[2][3] He secured the theological degree of doctor of philosophy from the Pontifical Gregorian University, Rome in 1927[7] and reached India in 1928 to complete his regency.
[7] After doing two years of research from 1938[7] at the herbarium of the Royal Botanical Gardens, Kew, England, he joined St. Xavier's College, Mumbai as a member of the faculty of Botany in 1940.
[7] Santapau returned to the St. Xavier's College, Bombay after his retirement from the Botanical Survey of India in 1967[8] and worked there as the rector till his death, aged 66, on 13 January 1970.
[2][3] Some of his notable publications are: Santapau is a recipient of the Order of the Alphonsus X the Wise award from the Government of Spain[2][3] He was selected for the Birbal Sahni Medal in 1963 by the Indian Botanical Society.
[5] In 1965, 2 botanists published Pauia, a monotypic genus of flowering plants from Arunachal Pradesh belonging to the family Solanaceae and named in his honour.