HAL HOLBROOK IN MARK TWAIN TONIGHT! continues to enthrall audiences, with Holbrook performing 20-25 shows a year. By Holbrook's estimation, he has now performed the show well over 2,000 times. Just as Mark Twain brought his wit and humor to far-flung places a half-century before, Holbrook-as-Twain has also performed around the world, from Saudi Arabia and Warsaw, to Edinburgh and New Delhi. Holbrook is not simply an impersonator of Mark Twain, he is an authority on the writer about whom Hemingway said, "American literature began."