Title: On War
Content:   Vom Kriege is a book on war and military strategy by Prussian general Carl von Clausewitz (1780–1831), written mostly after the Napoleonic wars, between 1816 and 1830, and published posthumously by his wife Marie von Brühl in 1832. It has been translated into English several times as On War. On War is an unfinished work. Clausewitz had set about revising his accumulated manuscripts in 1827, but did not live to finish the task. His wife edited his collected works and published them between 1832 and 1835. His ten-volume collected works contain most of his larger historical and theoretical writings, though not his shorter articles and papers or his extensive correspondence with important political, military, intellectual and cultural leaders in the Prussian state. On War is formed by the first three volumes and represents his theoretical explorations. It is one of the most important treatises on political-military analysis and strategy ever written, and remains both controversial and influential on strategic thinking.
Title: Marie von Clausewitz: The Woman Behind the Making of On War
Content:  Marie Von Clausewitz: The Woman Behind the Making of On War is a biography on Marie von Brühl, written by journalist and military historian, Vanya Eftimova Bellinger. The book was released in 2015.
Title: On War
Content: List of military theorists ; Philosophy of war ; Realpolitik 
Title: On War
Content: 1873. Graham, J.J. translator. Republished 1908 with extensive commentary and notes by Victorian imperialist F.N. Maude. ; 1943. O. J. Matthijs Jolles, translator (New York: Random House, 1943). This is viewed by some modern scholars as the most accurate existing English translation. ; 1968. Edited with introduction by Anatol Rapoport. Viking Penguin. ISBN: 0-14-044427-0. This is badly dated (based on the 1873 Graham translation), severely abridged (leaving out, for instance, Book Six on defense—which Clausewitz considered to be the stronger form of warfare), and badly biased (because of its Vietnam War era and the editor's hostility to "neo-Clausewitzian" Henry Kissinger). ; 1976/1984. Howard, Michael, and Peter Paret, editors and translators. Princeton University Press. ISBN: 0-691-05657-9. ; 1989. 
Title: List of authors in war
Content: Weston Ochse 
Title: Order of battle
Content: Carl von Clausewitz, J. J. Graham, Jan Willem Honig. On War. Contributor F. N. Maude, Barnes & Noble Publishing, 2004 ISBN: 0-7607-5597-3 
Title: List of authors in war
Content: Colby Buzzell 
Title: List of authors in war
Content: Jakob Walter 
Title: War on Peace
Content:  War on Peace: The End of Diplomacy and the Decline of American Influence is a 2018 book by American journalist Ronan Farrow, published on April 24, 2018 by W. W. Norton & Company.
Title: Marie von Clausewitz: The Woman Behind the Making of On War
Content:  The book explores the life of Marie von Clausewitz, who was a member of the noble German Brühl family and married to military theorist, Carl von Clausewitz. After her husband's death in 1831, Marie edited and published her husband's books, the most famous one being, On War. Author Vanya Eftimova Bellinger examines the life of a "wealthy, cultured, and politically engaged" woman through archives and letters written between Marie and her husband.

Question: Who is the author of On War?
Answer: Carl von Clausewitz.