The Korff School premiered this new opera by Tyler Goodrich White (composer) and Laura White (librettist) in 2019. “The Gambler’s Son” is adapted from Mari Sandoz’s 1960 novel “Son of the Gamblin’ Man,” which tells the true story of the founding of Cozad, Nebraska; its larger-than-life founder, John J. Cozad; and Cozad’s son, the illustrious American painter Robert Henri.