Robert Caro is writing his fifth installment on LBJ biography

[Douglas Caddy]

From the article: Mr. Gottlieb still works as an editor at Knopf and collects what he described as an entry-level salary. He continues to edit books by Mr. Caro, who is writing the fifth installment in his Johnson biography, and Ms. Morrison, who recently sent him the first 40 pages of her next book. He still uses No. 2 pencils to mark up manuscripts. At 85, he sees no reason to retire. “Why not, as long as I’m compos mentis?” he said.

http://www.nytimes.com/2016/09/24/books/robert-gottlieb-avid-reader-reluctant-writer.html