Mr. Grey, of course: http://www.youtube.com/cgpgrey
Thanks to the UCLA Galactic Center: http://www.astro.ucla.edu/~ghezgroup/gc/
Their images/animations were created by Prof. Andrea Ghez and her research team at UCLA and are from data sets obtained with the W. M. Keck Telescopes.
(and I must note that the images included in this video are of simulated accuracy based on anticipated upgrades to the interferometry system – the current real images are equally impressive but slightly less clear: http://www.astro.ucla.edu/~ghezgroup/gc/pictures/Future_GCorbits.shtml )
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Thanks to Nima Doroud and Alex Yale for contributions and to Perimeter Institute for support. Created by Henry Reich