Kathryn Witkowski’s performances reflect a wide-ranging versatility, encompassing diverse roles in both musical theatre and opera. She has portrayed characters as varied as Cathy in The Last Five Years and the Mother in Hansel und Gretel, demonstrating adaptability across different styles and genres. A notable highlight in her career is her portrayal of Carmen in Belmont Opera's Fall Scenes, which was praised for "the sultriness of Carmen [Witkowski’s] voice," capturing the essence and intensity of the character. These experiences showcase her commitment to bringing depth and authenticity to each role she undertakes.