His work as official "state artist", appointed by Kwame Nkrumah, shaped the national identity of the newly independent country of Ghana.
Antubam's art practice included easel painting, mural and mosaic, and wood carving.
As an educator and writer he encouraged Ghanaian artists and students to create work with an "African personality", that reflect local customs and traditions.
The principal, Father John Knight suggested to the governor, Arnold Hodson to commission the young Antubam to make a clay bust.
In the 1950s, Antubam developed various works of arts and craft including Nkrumah's presidential mace and chair, various state commissioned relief mural carvings.