The Hollywood Reporter's 25 Most Influential Interior Designers in L.A.

That Hallworth chose dandy Beau Brummel, who invented the modern men’s suit, as the inspiration behind her “thinking man’s den” in THR’s showhouse is telling for this designer and gallery owner. (She names James Franco as a Brummel for today.) She creates maximum impact through her use of saturated hues (“I drench the space in a pigment and then play with textures,” she says) and “a few great pieces that are particular to each person.” Notable among her works is a faux-bois branching effect that started out as a “giant tieback and sconce that was an homage to Jean Royere” but took over a wall in the Santa Monica house of producer Laura Ziskin (who died last year).

She derives added inspiration from her clients: “They’re young, really good eggs, immensely intelligent and have an energy that’s off the charts, and I thrive on that.” Hallworth, who says she “can’t live without my job — and my horses,” is also an avid connoisseur of craftsmanship: “I love the history of old-school Hollywood and the old way of doing things, when the focus was on quality of construction — of the gown or the interior.”

Most anticipated set: “I’m excited to see [Munsters remake] Mockingbird Lane. For the gothic sensibility.”