Mark Roberge, Chief Revenue Officer, HubSpot

When Mark Roberge joined HubSpot in 2007, he had never run a sales team. So he stuck with what he knew how to do and created a system of hiring and development that relied heavily on metrics and quantitative analysis (he was trained as an engineer at MIT). Mark grew to serve as HubSpot's SVP of Worldwide Sales and Services until 2013, during which he increased revenue over 6,000% and expanded the team from 1 to 450 employees.