Aaron Merritt Hills was an American author and historian known for his detailed accounts of religious figures and movements in the 19th century. His most notable work, 'Life of Charles G. Finney,' provides an in-depth biography of the influential revivalist preacher and theologian Charles Grandison Finney, who played a pivotal role in the Second Great Awakening. Hills meticulously chronicled Finney's life, emphasizing his contributions to evangelical Christianity and the broader social reform movements of his time. In addition to his biography of Finney, Hills contributed to the understanding of the religious landscape of his era through various writings that explored the intersections of faith, society, and personal transformation. His works are significant for their historical context and for shedding light on the fervor of religious revivalism in America, making him an important figure in the study of American religious history. Hills' legacy endures through his scholarly contributions that continue to inform discussions on the impact of revivalist movements on American culture and spirituality.