About Clay Chattaway Clay Chattaway is a cattle rancher and grandson of Roderick Riddle Macleay. With his wife, Avril, three sons and their families, Clay operates the 20 000 acre Bar S. Ranch in the Porcupine Hills west of Nanton, Alberta. Books by Clay Chattaway Rocking P Ranch and the Second Cattle Frontier in Western Canada by (author) Clay Chattaway with Warren Elofson