Guided tours of Rockefeller Center don’t usually start with cocktails and bar snacks at the upscale French restaurant Le Rock. Nor do they typically end with pasta and a 30-layer chocolate cake at Jupiter, a popular Italian restaurant at the plaza in Midtown Manhattan.

But Beverly Nguyen, who led a group around Rockefeller Center on a recent Tuesday evening, is not your standard tour guide. For the group of marketing and public-relations executives from brands like Ralph Lauren, Cartier and Versace that she was showing around, Ms. Nguyen had arranged access to some “special spaces,” she said, while standing in front of Isamu Noguchi’s plaque sculpture “News,” carved into the facade of one of the plaza’s Art Deco-style buildings.

Though not a household name, Ms. Nguyen, 33, has, through a multi-hyphenate career, made a name for herself in various industries.

She is a fashion stylist and consultant who has worked with clothing brands

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