context: McCallister was Tris Speaker's primary assistant during his years as player-manager (1919–1926).
source: McCallister became manager after Speaker's sudden resignation in late 1926.
reference_original: McCallister se convirtió en director después de la inesperada dimisión de Speaker a finales de 1926.
reference_flipped: McCallister se convirtió en directora después de la inesperada dimisión de Speaker a finales de 1926.