The notable abolitionist and author of "Narrative of the Life of Frederick Douglass" was Frederick Douglass himself. Born into slavery, Douglass escaped and became a leading voice in the abolitionist movement, advocating for human rights and equality. His autobiographies vividly depict the injustices of slavery and his journey towards freedom. Douglass's powerful oratory skills and writings played a crucial role in shaping public opinion against slavery, making him a significant figure in American history.