Series 9 contains correspondence and other materials pertaining to the preparation of a biography of S. Weir Mitchell. Talcott Williams (1849-1928), a friend of S. Weir Mitchell and the Mitchell family, agreed to write a biography of Mitchell in 1916, but he died before the project was completed. Series 9 contains Williams's correspondence, most of which pertains to his attempt to collect copies of Mitchell correspondence; included are letters from Robert Abbe, John Shaw Billings, Harvey Cushing, Bayard Henry, William W. Keen, Amelia Gere Mason, and Owen Wister. Anne K. W. Mitchell, as the inheritor of S. Weir Mitchell's papers, oversaw the biographical project from the start; Series 9 includes her correspondence with Fielding H. Garrison, William W. Keen, Louisa S. Minot, Langdon Elwyn Mitchell, and Beverley R. Tucker. After the death of Talcott Williams in 1928, Anne K. W. Mitchell hired Anna Robeson Brown Burr (1873-1941) to complete the biography; some of Burr's correspondence is also in Series 9. Subseries 9.4 contains a large collection of typescript notes, probably prepared by Anne K. W. Mitchell's assistant, Elizabeth Dunbar, which were used in the preparation of the biography. Other papers pertaining to the biographical project, such as contracts and publication materials, are in Subseries 9.5.