Mason traveled the length and breadth of the country and many foreign lands preaching and establishing COGIC churches. Bishop Mason was not exclusive in his ministry, he preached in COGIC and non-COGIC churches alike. He also preached to interracial audiences as well. In fact Bishop Mason licensed several white Pentecostal ministers and in 1914 he preached at the founding meeting of the Assemblies of God. In 1911, he established the first auxiliaries and departments of the church including: Women, Young People Willing Workers (YPWW), and Sunday School. In 1917, he was monitored by the government for speaking in opposition to America's entrance and support of World War I. His opposition, however, stemmed from the use of African-American men being called to fight for democracy abroad while having to face racism and discrimination here at home. In 1917, he also purchased 400 acres in Lexington, MS to establish the Saints Industrial and Literary School. The school began classes in 1918 and eventually became Saint's College. The college was the major institution of higher learning for COGIC youth until closed in 1976.