Timothy Leary, the Harvard professor and later LSD Guru, was apparently convinced he was the embodiment of Aleister Crowley's Thelemic current...

Pamela Lydon Travers, the author of the Mary Poppins series, was a disciple of George I. Gurdjieff. This, according to Massimo Introvigne, can be detected throughout her Poppins books:
bitterwinter.org/mary-poppins...?

Carl W. Hansen, "ben Kadosh" (1872-1936) was a Danish Esoterist and the first known registered Luciferian. He was connected to the French scene (Bricaud), the German (Reuss), the Italian (Frosini) and the Swedish (Wallen). He was even the head of the Danish: OTO, Martinism, Memphis Misraim, etc.

In 1903, Aleister Crowley met Agustin Rodin, and put verse to some of his sculptures. The most famous being perhaps "Le Baiser" (The Kiss).

For AC's Rodin inspired poetry:
hermetic.com/crowley/coll...

Hilma af Klint, the prolific Swedish painter, who is said to have painted abstract paintings years before it was a thing. She was first a Theosophist and later an Anthroposophist. After completing a classical education, was was commissioned by a spirit for the "Paintings for the Temple" series.

Interestingly, the great psychedelic artist Alex Grey listed Theosophic Society in America (Adyar) as one of his influences (from a list on his website that is no longer available). For more info see:
www.calendarsblog.com/alex-grey/

Let us take a moment to appreciate the theosophical influences upon Piet Mondrian's painting "Composition in Red, Blue and Yellow'

Arild Rosenkrantz, the only Danish artist to participate in the Salon de la Rose+Croix, and that unwillingly. His participation was secured via pressure from his mother, who was enthusiastic about the project. Arild would later become an Anthroposoph.