He taught various skills to the Ugandan people, including carpentry and farming, as well as other practical skills. He laid down the foundation for education. He was named Muzunguwa Kazi by the Ugandans. The name means "white man of work."
A visiting bishop created problems for the Christians in the area, bringing in a time of persecution. Mr. Mackay was eventually forced to move south of the lake. He managed to translate the gospel of Matthew into the language of the people before contracting malaria and dying.
Sources:
biblical training
World digital library
Worldwide missions 2
wikipedia
Mackay college
Worldwide missions