Many of you on here are probably aware of Dr Alexander's work, for those of you who aren't I highly recommend looking at these sites and the accompanying research.
The Simplicity Institute website.
Simplicity Collective blog.
Research paper on the Voluntary Simplicity Movement.
And if you consider yourself a voluntary simplifier (basically if you're taking steps to reduce your consumption) please fill out the survey, linked on this page http://simplicityinstitute.org/our-research