Francis Bacon (1909-1992)
A dominant figure of British postwar art
https://www.artsy.net/article/artsy-editorial-francis-bacon

Portrait of George Dyer and Lucian Freud / 1967 / Oil on canvas / 78”x58”

Agnes Martin (1912-2004)
Canadian-born American abstract painter
https://hyperallergic.com/219948/agnes-martin-in-two-new-books-a-life-revealed/

Wood I / 1963 / Ink, colored ink, ballpoint pen, and pencil on paper / 15”x15 1/2″