In October 2009, Harbach's opera O Pioneers!, based upon the Willa Cather novel of the same name, received its world premiere at the University of Missouri-St. Louis.
His directing credits include small-screen adaptions of The Picture of Dorian Gray, Les Misérables, Hogan's Goat, Eccentricities of a Nightingale, A Streetcar Named Desire, O Pioneers!, and A Christmas Memory.
O Pioneers! (2001), musical with music and lyrics by Atkey and a book by Robert Sickinger
The "White Mulberry Tree" is title of a crucial chapter in Willa Cather's 1913 novel, O Pioneers!, in which two forbidden lovers are killed, a reference to the story of Pyramus and Thisbe.
The press is publisher of the scholarly editions of the works of Willa Cather, including the classics My Antonia and O Pioneers!.
Young Pioneers | Sons of the Pioneers | O Pioneers! | Mormon pioneers | Pioneers | pioneers | (Young) Pioneers | Wilkes-Barre/Scranton Pioneers | Western Mass Pioneers | Daughters of Utah Pioneers | Young Pioneers (novel) | Young Pioneers' Christmas | Union of Pioneers of Yugoslavia | Tomorrow's Pioneers | The former Pioneers' Palace in Sormovo | Rochdale Society of Equitable Pioneers | Rochdale Pioneers Museum | Pioneers Park | O Pioneers! (opera) | MidAmerica Nazarene Pioneers | Malawi Young Pioneers | List of railway pioneers | 81st Pioneers | 64th Pioneers | 61st Pioneers | 23rd Sikh Pioneers | 2005 Wilkes-Barre/Scranton Pioneers season | 107th Pioneers |
Willa Cather, O Pioneers! with introduction, notes, and chronology (Oxford and New York: Oxford University Press, 1999).