I’ve seen him at several geisha shows, but didn’t realize that he was photographing the events. His name is Kylearan Brandriss and his photo gallery on Flickr feature many from geisha shows and related activities, and are some of the best I’ve seen. I’ve never even met Kylearan, but am definitely a fan of his work. Checkout Kylearan_SL’s photostream.
Photo from Kylearan Brandiss gallery: Geisha from five okiyas, including Karyukai, Blue Lotus, Little Yoshiwara, Amatsu Shima, and Pontocho.