In my review of Karen Severns and Koichi Mori’s Magnificent Obsession: Frank Lloyd Wright’s Buildings and Legacy in Japan [July 22] I said that Arata Endo was the only person with whom Wright ever agreed to share architectural credit, information I got from the documentary. But my brother Alvin Rosenbaum, author of the 1993 book Usonia: Frank Lloyd Wright’s Design for America, tells me that Wright shared credit with at least one other person, Aaron Green, “on their joint San Francisco office,” adding that “their major collaboration, the Marin County Courthouse, was finished after Wright’s death.”

Jonathan Rosenbaum