8. Michael Valentine
After more than five years at firewall manufacturer Fortinet, most recently as the vice president of sales and support for the Americas, Michael Valentine joined rival network security company Sophos in February as its senior vice president of worldwide sales. Valentine filled part of the gap after North American Channel Chief Matt Fogelgren left Sophos for software company Attivio that same month, but Valentine made headlines of his own just days later in an interview with CRN in which he announced that the enterprise-geared company would begin focusing on midmarket growth. At Fortinet, Valentine led the sales team during the company's IPO in 2009 and expanded its tech distributors as well as its internal channel team, Sophos told CRN. Though not main competitors, Fortinet and Sophos certainly compete in the cybersecurity world.