Guy Podjarny (Guypo) is a web performance researcher/evangelist and Akamai's Web CTO, focusing primarily on Mobile and Front-End performance. As a researcher, Guy frequently runs large scale tests, exploring performance in the real world and matching it to how browsers behave, and was one of the first to highlight the performance implications of Responsive Web Design. Guy is also the author of Mobitest, a free mobile measurement tool, and contributes to various open source tools. Guy was previously the co-founder and CTO of blaze.io, acquired by Akamai in 2012.