Top Left: Heurtley House, 1902, Oak Park
Top right: Frank Wright Thomas House, 1901, Oak Park
Bottom Left: The Spies-Robinson House, Portland, OR
Bottom Right: Reuben Weil House, Spokane, WA

Hello Lauren,
If I am correct those sure look like Frank Lloyd Wright was the designer of those houses.

I wrote quite a bit about him in the History that can be found in the first forum of these forums. Defining the Movement.

Respectfully,

Ralph Jones