William M. Jeffrey was born in N.Y. in Feb. 1884, the son of Joseph and Alice Jeffrey. In 1890, the family moved to Diamond Creek, Chase County, Kan. where Joseph Jeffrey owned a general store. William Jeffrey was a graduate of the University of Colo. and during WWI, served as a 1st Lieutenant in the Engineers. He worked as a highway engineer for the Bureau of Public Lands and on such notable projects as the construction of Monarch Pass (south-central, Colo.). Jeffrey was married to Mildred Saunders in 1920. The couple had four children: Joseph J., Mary L., Horace S., Sarah E. Jeffrey.
From the description of William Jeffrey family papers, 1917-1938 [manuscript]. (Denver Public Library). WorldCat record id: 672025683
