Hal Holbrook on the left and his alter ego, Mark Twain, on the right.February 18, 2025: Theatre Yesterday and Today, by Ron Fassler Yesterday marked 100 years since the birth of Harold Rowe Holbrook Jr., the much admired actor whose voluminous work on stage, film, and television garnered him nearly every award imaginable, especially in the theatre. He won a Tony, an Obie (for distinguished work off-Broadway), a…