David Strathairn. A consummate character actor, always terrific, even in lousy films. He's been in a zillion movies and TV shows. Even if you don't recognize his name, I can almost guarantee you've seen him in something, probably multiple somethings. Fantastic in "The Expanse," probably recognizable to most people for his role in "A League of Their Own."
I met him once very briefly when I was rehearsing a show in one of those cardboard cut-out rehearsal spaces in NYC. He was rehearsing something in the studio next to ours, no idea what it was. Seemed like a regular nice guy.
With the notable exception of "Good Night and Good Luck" where he does a fantastic representation of Edward R. Murrow, I don't think he's ever been in a leading role in a film or on TV, but he always makes his characters interesting, sometimes to the point where you'd rather know more about his character than the leading ones.