Rock crawling champion, Monster Jam driver and YouTube host Nicole Johnson has done it all – literally.

With 460,000 YouTube subscribers and growing, Stephan Papadakis, the owner of Papadakis Racing in Carson, California, is a trailblazer in race engine building, and now a media dynamo as well.He calls his YouTube success ‘unexpected’. “It’s been a windfall of exposure for everything we do, and that’s been great,” he...