He was in the real estate and resort business and operated a general store in Lac du Flambeau, Wisconsin.
Yeschek was the town chairman of Lac du Flambeau and also served on the Vilas County, Wisconsin Board of Supervisors.
During the 1949 session, Yeschek served in the Wisconsin State Assembly and was a Republican.
In 1967, Yeschek was killed in an automobile accident in Lac du Flambeau when his car hit a tree.
This article about a Republican Party member of the Wisconsin State Assembly born in the 1890s is a stub.