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.
I agree with Gene, that's why I started this thread, in one of my older magazines, which I can't seem to find right now, Brett Weston was described as an Abstract Expressionist. I have only seen that reference once and was interested in seeing if any other photographers had gained that description.

I came across a new book, to me, on Edward Weston, that is a completely new light on the man and his family background. It's called Edward Weston: A Photographer's Love of Life. It's really heavy, very well printed and the text is fantastic with red references in quotes from the Daybooks. This is a rather large book, heavy to hold but loaded with photographs I haven't seen before.