Ivan Sergeevich Turgenev was a Russian novelist, poet, and playwright. He is best known for his novel "Fathers and Sons," which explores the generational divide between the older, traditional Russian aristocracy and the younger, more radical generation. Turgenev's works often focused on the social and political issues of his time, and he is considered one of the most important Russian writers of the 19th century. His writing style is characterized by its psychological depth and emotional sensitivity.