Question: Edward Anthony Spitzka autopsied the brain of the American anarchist who assassinated which President?

full_context: Document 1: Edwin Davis (executioner): Edwin F. Davis (May 28, 1846 – May 26, 1923), of Corning, Steuben County, New York was the first "state electrician" (executioner) for the State of New York. In 1890, Davis finalized many features of the first electric chair used. Davis performed 240 executions between 1890 and 1914, including the first person to be executed by electric chair, William Kemmler, and the first woman Martha M. Place, as well as the assassin of William McKinley, Leon Frank Czolgosz.
Document 2: Bruce Edwards Ivins: Bruce Edwards Ivins (April 22, 1946 – July 29, 2008) was an American microbiologist, vaccinologist, senior biodefense researcher at the United States Army Medical Research Institute of Infectious Diseases (USAMRIID), Fort Detrick, Maryland, and the key suspect in the 2001 anthrax attacks.
Document 3: William Kemmler: William Francis Kemmler (May 9, 1860 – August 6, 1890) of Buffalo, New York, was a convicted murderer and the first person in the world to be legally executed using an electric chair.
Document 4: Stanley Ketchel: Stanisław Kiecal (September 14, 1886 – October 15, 1910), better known in the boxing world as Stanley Ketchel, was a Polish American professional boxer who became one of the greatest World Middleweight Champions in history. He was nicknamed "The Michigan Assassin." He was murdered at a ranch in Conway, Missouri, at the age of 24.
Document 5: Alton Parker presidential campaign, 1904: After U.S. President William McKinley was assassinated in 1901, Theodore Roosevelt became the new U.S. President. Roosevelt's first term was notable for his trust busting, his successful arbitration in and resolution of a 1902 strike of 150,000 Pennsylvania coal miners, his advocacy against lynching, his conservation efforts, and the Panama Canal Treaty. In 1904, Roosevelt easily defeated Bourbon Democrat Alton Parker and won a second term as U.S. President.
Document 6: American Anthropometric Society: The American Anthropometric Society was an association for acquiring and storing brains of eminent persons for the purpose of research. The society was founded in 1889 in Philadelphia. Edward Anthony Spitzka, M.D., professor of anatomy at Jefferson Medical College, presented a paper on March 16, 1906 about his study of six brains bequeathed to the society.
Document 7: Edward Anthony Spitzka: Edward Anthony Spitzka (June 17, 1876 – September 4, 1922) was an American anatomist who autopsied (29 Oct 1901) the brain of Leon Czolgosz, the assassin of president William McKinley. (In 1881, his father Edward Charles Spitzka, a famous neurologist and medical specialist in mental diseases, testified to the insanity of Charles Guiteau, the assassin of President James A. Garfield, at Guiteau's murder trial.)
Document 8: Leon Czolgosz: Leon Frank Czolgosz (Polish: "Czołgosz" ; May 5, 1873 – October 29, 1901) was an American anarchist and former steel worker who assassinated U.S. President William McKinley in September 1901. Czolgosz was executed just over seven weeks later.
Document 9: Mark Gray (attempted assassin): Mark Gray (attempted assassin) was a traveling salesman from Keokuk, Iowa who fired two shots from a pistol at actor Edwin Booth on April 23, 1879. Booth was playing the title role in Richard II (play) at McVickers Theatre in Chicago, Illinois, during the final act of the William Shakespeare tragedy. Gray gave as his motive a wrong done to a friend by Booth.
Document 10: Park Dietz: Park Dietz (born 1948) is a forensic psychiatrist who has consulted or testified in many of the highest profile US criminal cases including Joel Rifkin, Arthur Shawcross, Jeffrey Dahmer, The Unabomber, Richard Kuklinski, the Beltway sniper attacks, and Jared Lee Loughner.
Document 11: Edward Charles Spitzka: Edward Charles Spitzka (November 10, 1852 – January 13, 1914) was an eminent late-19th century alienist, neurologist, and anatomist. Dr. Spitzka was the author of the landmark psychiatric manual ""Treatise on Insanity, Its Classification, Diagnosis and Treatment"" published in 1883. He pioneered studies of the anatomy of the human nervous system, and discovered the interoptic lobes of saurians in the human brain.
Document 12: John Flammang Schrank: John Flammang Schrank (March 5, 1876 – September 15, 1943) was a resident of New York, best known for his attempt to assassinate former U.S. President Theodore Roosevelt on October 14, 1912, in Milwaukee, Wisconsin.
Document 13: Gavrilo Princip: Gavrilo Princip (Serbian Cyrillic: , ] ; 25 July [O.S. 13 July] 1894 28 April 1918) was a Bosnian Serb member of Young Bosnia, a Yugoslavist organization seeking an end to Austro-Hungarian rule in Bosnia and Herzegovina. He assassinated Archduke Franz Ferdinand of Austria and his wife, Sophie, in Sarajevo on 28 June 1914, setting off a chain of events that would lead to outbreak of the First World War. Princip and his accomplices were arrested and implicated the Serbian nationalist secret society known as the Black Hand, leading Austria-Hungary to issue a démarche to Serbia known as the July Ultimatum. This was used as pretext for Austria-Hungary's invasion of Serbia, which then led to World War I. Princip was a Yugoslav nationalist associated with the movement Mlada Bosna (Young Bosnia) which predominantly consisted of Serbs, but also Bosniaks and Croats. During his trial he stated: "I am a Yugoslav nationalist, aiming for the unification of all Yugoslavs, and I do not care what form of state, but it must be freed from Austria." Princip died on April 28, 1918, from tuberculosis caused by poor prison conditions that had cost him a limb earlier.
Document 14: Antonio Macías del Real: Antonio Macías del Real (1866–1939) was a Spanish writer and pharmacist that moved to Guatemala where he wrote for most prestigious cultural publications. Among his articles are those that we wrote for "La Ilustración Guatemalteca" during the last year of general José María Reina Barrios presidency. When the president was assassinated on 8 February 1898, Macías del Real wrote "Perfiles biográficos de don Manuel Estrada Cabrera" ("Biographical profiles of Mr. Manuel Estrada Cabrera", who had been appointed as interim President; Macias del Real kept writing on behalf of the new president since then. In 1902 his adulation paid off, as Estrada Cabrera granted him the Pacific Railroad concession. According to Guatemalan historian Rafael Arévalo Martínez in his book "¡Ecce Pericles!", Macías del Real -a pharmacist graduated from Universidad Central de Madrid and later incorporated in Guatemala- was the one that gave Estrada Cabrera a potent venom that the latter used to get rid of his opponents.
Document 15: Chester A. Arthur: Chester Alan Arthur (October 5, 1829 – November 18, 1886) was an American attorney and politician who served as the 21st President of the United States (1881–85); he succeeded James A. Garfield upon the latter's assassination. At the outset, Arthur struggled to overcome a slightly negative reputation, which stemmed from his early career in politics as part of New York's Republican political machine. He succeeded by embracing the cause of civil service reform. His advocacy for, and subsequent enforcement of, the Pendleton Civil Service Reform Act was the centerpiece of his administration.
ground_truth: William McKinley