Steichen comes to mind. Minor White. Newman maybe. Let's see.. more recently, I was introduced to Sarah Moon and there is one photogrpah in particular which I find extremely effective in this regard,
The Juggler, Circus (2002). She uses very stark black spaces in many mages, which set off the colours and subjects very well.
I am really big on negative space myself, and though I doubt I am the person you refer to with the cloud, I have gotten various inquiries about
this shot and how I "did" it. (Some people see a downwards facing horse...) Anyway I won't argue about the effectiveness of the negative space, it's what I wanted and that's that
I use lots of negative space sometimes... a lot of people do. 'Nothing' can add balance.