After a short stay at the ranch he moved to El Paso, Texas in 1910 to begin his career in the construction and engineering field.
His company quickly grew completing many projects in El Paso including the Knickerbocker Apartments.
His company would later begin to expand opening additional offices in Dallas, Santa Fe, Los Angeles and Honolulu.
The stature of McKee as a contractor led to many clients including Conrad Hilton, and the United States Government.
[1] For the company's work at Los Alamos, New Mexico the employees were presented the Army-Navy "E" Award for excellence.