Jason Fraley interviews actor Richard Thomas, who stars in "Mark Twain Tonight" at the National Theatre in Washington D.C. this Saturday and Sunday, inheriting the role of Mark Twain from the late Hal Holbrook. They also discuss his Emmy-winning TV career in “The Waltons,” “The Americans” and “Ozark,” as well as his Tony-nominated Broadway career in “The Little Foxes” and touring as Atticus Finch in “To Kill a Mockingbird.” (Theme Music: Scott Buckley's "Clarion")