21. Mark Slaga
Mark Slaga is giving rivals fits by leading the charge on blockbuster deals such as Dimension Data's acquisition of $471 million solution provider Nexus IS, No. 78 on CRN's Solution Provider 500 list. It's all part of the South Africa-based global solution provider's bid to double sales over the next five years driven with best-in-class complex managed services and outsourcing. He's the right executive with the right stuff at the right time.