The Papers of Andrew Johnson Project began in the mid-1950s as part of a larger trend toward projects for the collection and publication of presidential papers. The project was headed by University of Tennessee historians LeRoy Graf and Ralph Haskins and led to its conclusion by Paul Bergeron. The project became part of the Tennessee Presidents Center in 1987, joining the papers projects of the two other Tennessee presidents, Andrew Jackson and James K. Polk. The first volume of The Papers of Andrew Johnson was published in 1967 and the project was completed on July 31, 2000, with the publication of the sixteenth and final volume. The entire project covers Johnson's correspondence from 1858 to 1875.