Can I get feedback on my parallax, responsive, static gh-pages website?

I want to get better at creating highly-performant, responsive websites. I work with a great group of engineers but we only know as much as we know. I am hoping someone might offer some constructive criticisms on a website I built so that I can, frankly, just get better!

www.benjaminbuckingham.com

Here's some info about the website:

* Github pages: https://github.com/GregM/benjamin-buckingham-dot-com * ParallaxJS for fancy animations * Also using keyframe animations * Picturefill for responsive images * Google fonts for better design * MediaQueries at a few non-standard break points * I cut the images myself and tried to balance file size vs user perception of quality * I didn't use a sprite and am wondering if I should. * I should probably minify the CSS and JS.

Thanks ahead of time!