I don't know how much or if at all Brett Weston was influenced by the Abstract Expressionists, but I find in his work many compositional similarities to both Motherwell and Kline. This is one of the main reasons I have always liked his work. I am drawn to Brett's work more than that of his father's, who I also like very much.
Motherwell and Kline were a couple of my artistic heroes when I was young art student many years ago.