I loved him in the movie Boundaries in 2018 and of course in The Sound of Music. He also was in Beginners where he played a museum director who comes out after 44 ears of being married. He and his son enter a new relationship on his coming out. Plummer won a supporting actor Oscar for this role. A true film and theater giant has lost one of their greats.
https://www.yahoo.com/entertainment/oscar-winner-sound-music-star-181609378.html