33. Benjy Leibowitz — Founder of INHOUSE

Leibowitz became head maitre D' of the NoMad, Eleven Madison Park's sister restaurant, at just 23 years old. There he set up a reciprocity network for connecting top maître D's and best-in-kind restaurant regulars — and it was a great success.

The network grew until Leibowitz could no longer handle his workload at the NoMad and his project at the same time. So, he rolled the dice and turned his network into a high-end members' club called INHOUSE, which now counts Fortune 500 CEOs among its subscribers.

The idea is that INHOUSE members are treated like regulars at whichever restaurant in the network they choose to dine at — from knowing what wines they're into, to where they like to sit, to whether they have a sweet tooth.

After closing their last round of funding, the team is looking to expand into London and across the US, starting in San Francisco and Los Angeles, then Chicago, Miami, or Seattle.

Read more: A $1,550-a-year private members' club for restaurant regulars just raised $2 million to expand around the globe