The renowned author known for their extensive studies on war and peace is Leo Tolstoy. His epic novels, especially War and Peace, explore the relationship between individuals and society against the backdrop of historical conflict. Tolstoy's philosophical inquiries into the nature of humanity, morality, and the impact of war on the human experience have cemented his status as a literary giant. His ethical reflections and moral dilemmas continue to resonate, making his works essential reading in discussions around peace, conflict, and the complexities of human nature.