Upon returning to Thailand, his first job was in the field of banking; but his true vocation was his mastery of many forms of arts, including politics and journalism. Put off by Hollywood's portrayal of revered nineteenth-century king, Mongkut, in the 1946 film "Anna and the King of Siam", based on the semi-fictional biographical novel of the same name, Kukrit and his brother, Seni Pramoj, wrote "The King of Siam speaks" in 1948. They sent their manuscript to the American politician and diplomat Abbot Low Moffat who drew on it for his biography entitled "Mongkut the King of Siam" (), and in 1961, donated the Pramoj manuscript to the Southeast Asian Collection, Asian Division, Library of Congress. He wrote for "Siam Rath", the newspaper that he founded.