Rand Fishkin is no stranger to lists like this one. Rand is the founder and 'Wizard of Moz' at the famed SEO software development company - Moz (Formerly SEOmoz). Though they began as an search engine optimization consultancy, eventually grew into an SAAS organization which collects and organizes vast amounts of data about the search industry as a whole. Today, the information that Moz puts out is valued highly among the world's top SEO experts.