Question: Edwin F. Davis, of Corning, Steuben County, New York was the first "state electrician" (executioner) for the State of New York, Davis performed 240 executions between 1890 and 1914, including the first person to be executed by electric chair, including which convicted murderer, and the first person in the world to be legally executed using an electric chair?
Context: James Neil Tucker (January 12, 1957 – May 28, 2004) was a convicted murderer executed by the U.S. state of South Carolina by means of the electric chair.  The electric chair would not be used again in the United States until July 20, 2006, in the state of Virginia.  He had been convicted of the murders of Rosa Lee Dolly Oakley and Shannon Lynn Mellon. Arthur Hodges (c. 1893 – December 18, 1914) was a white man who became the first person in Clark County, Arkansas to be executed by means of the electric chair.  Prior to that all executions were carried out by way of hanging or firing squad.  He was the fourth person so executed in Arkansas and one of eight men executed by the state in a 16-day period.  The eight executions in a 16-day period were the subject of an article, "Eight to Die in Arkansas", published in "The Kansas City Star". John W. Hulbert, Jr. (also John Hurlbert) (September 1867, Auburn, New York – February 22, 1929, Auburn, New York) was the executioner for the states of New York, New Jersey and Massachusetts from 1913 to 1926.  Hulbert was trained as "state electrician" by his predecessor, Edwin F. Davis, and oversaw 140 executions during his tenure. 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. Joseph R. Ernst (d. July 31, 1962) was a convicted murderer who was executed at the New Jersey State Prison electric chair on July 31, 1962.  He was the 159th convict to be executed in the New Jersey electric chair since 1907. Harold Lamont "Walkin' Wili" Otey (August 1, 1951 – September 2, 1994) was convicted of the murder of Jane McManus.  Despite recanting his confession and maintaining his innocence for more than 15 years, Otey became the first person to be executed in Nebraska since 1976 when the death penalty was reinstated.  He was executed in 1994 by the State of Nebraska by electrocution, becoming the first person to die in Nebraska's electric chair since Charles Starkweather was executed in 1959.  Otey's final days were documented by the CBS News program "48 Hours" entitled "Death by Midnight". Dow B. Hover (c. Nov 16 1900 – June 1, 1990) was the last person to serve as a State Electrician (executioner) for the state of New York, the operator of the electric chair; and he was the last person to serve as an executioner in the now no-death penalty state.  He was the last surviving executioner from New York. The following is a list of people executed by the U.S. state of Texas between 1920 and 1929.  A total of 66 individuals were executed during this period.  From 1920 to 1923, ten individuals were executed by hanging.  The last hanging in the state was that of Nathan Lee, a man convicted of murder and executed in Brazoria County on August 31, 1923.  The law was changed in 1923 requiring executions be carried out on the electric chair and that they take place at the Huntsville Unit in Huntsville, Texas.  From 1924 to 1929, 56 individuals were executed by electrocution, the first 5 individuals executed by this method took place on February 8, 1924 (this remains a state record for the number of executions in a single day). Brandon Wayne Hedrick (February 23, 1979 – July 20, 2006) was a convicted murderer who was executed by electric chair by the U.S. state of Virginia.  He was convicted of the 1997 murder of 23-year-old Lisa Crider, who was kidnapped, robbed, raped, and shot in the face.  He was the first person electrocuted in Virginia since 2003, when Earl Bramblett was executed for rape and murder. 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.
Answer: William Francis Kemmler