Rasmus Lerdorf is known for having gotten the PHP project off the ground in 1995 and has contributed to a number of other open-source projects over the years. He was an infrastructure architect at Yahoo! for more than 7 years and joined Etsy in 2012.
He was born in Greenland, grew up in Denmark and Canada and has a Systems Design engineering degree from the University of Waterloo. You can follow @rasmus on Twitter.