MICHAEL ZHANG, PETAPIXEL:
"Mitch Martinez is a Philadelphia-based director of photography and cinematographer. Over the past 2.5 years, he has been working on building a free library of 4K stock footage. Since its inception in January 2013, the collection of clips has become an impressive resource: the 1,500+ clips have been downloaded over 300,000 times, and they been used by some of the largest companies in the world."
Check it out, here.