National Gallery of Art two months after excavation had begun. At the time of its inception it was the largest marble structure in the world. The museum stands on the former site of the Baltimore and Potomac Railroad station, where in 1881 a disgruntled office seeker, Charles Guiteau, shot President James Garfield (see James A. Garfield assassination). As anticipated by Mellon, the creation of the National Gallery encouraged the donation of other substantial art collections by a number of private donors. Founding benefactors included such individuals as Paul Mellon, Samuel H. Kress, Rush H. Kress, Ailsa Mellon Bruce, Chester Dale, Joseph Widener, Lessing J.
Charles J. Guiteau criminal psychologist Kent Kiehl diagnosed Guiteau as a psychopath, giving him a score of 37.5 out of 40 on the PCL-R scale. The life of Guiteau, focusing on his psychological disturbances and his plan to kill Garfield, is the subject of "Portrait of an Assassin", a radio play by James Agate Jr. The play was produced as Episode 1125 of CBS Radio Mystery Theater and was first broadcast on October 8, 1980. Guiteau is depicted in Stephen Sondheim and John Weidman's musical "Assassins", wherein he mentors Sara Jane Moore, a woman who attempted to assassinate Gerald Ford. Guiteau sings parts