The Aussie digital sales executive launched his online SEO company this year after winning Lord Sugar's £250,000 investment.
And Mark has discovered that there's no acting from the millionaire boss on the show.
"He is actually more scary in real life," Mark said this week. “It’s safe to say it’s not an act on The Apprentice — he isn’t pretending to be terrifying."
However it's not quite the same scenario when it comes to one of Lord Sugar's right had men Claude Littner, who we've seen challenge and interrogate hopefuls during the show's interview stages.
Mark told The Sun newspaper: "I bumped into Claude the other day and in real life he’s just the loveliest guy.
“He’s really supportive and so friendly, completely opposite to the show — perhaps I just ruined his cover.”
It was reported earlier this month that Mark had already turned a profit with his business, earning him the title as the show's "fastest-earning Apprentice".
Mark confirmed: “We are doing really well. We’ve been going two-and-a-half months and we’ve made £12,000 profit and already taken on ten staff.”