Upon his return in fall 1899, McKay taught at the high school level at LDS Weber Stake Academy (predecessor of Weber State University). He married Emma Ray Riggs in the Salt Lake Temple on January 2, 1901. They eventually had seven children, one dying as a young child. his first three years at Weber, McKay taught mainly religion and literature classes. On April 17, 1902, McKay was appointed principal of Weber, succeeding the founding principal, Louis F. Moench, who had resigned after nine years in the position. One of his first actions as principal was to organize a school paper.