Bertha Muzzy Sinclair-Cowan, better known by her pen name B. M. Bower, was a pioneering American author renowned for her Western novels. She began her writing career in the early 1900s, achieving significant success with her first novel, Chip of the Flying U (1906), which introduced readers to the fictional Flying U Ranch and its cowboys. Bower's authentic portrayal of ranch life, drawn from her experiences in Montana, set her work apart in the Western genre. Over her career, she authored more than 60 novels and numerous short stories, many of which were adapted into films. Her use of a gender-neutral pen name allowed her to navigate the male-dominated literary landscape of her time. Bower's contributions significantly shaped the Western genre, and her works continue to be celebrated for their humor, realism, and pioneering spirit.