The Hermann Hagedorn papers contain correspondence, writings, clippings, and other materials documenting the life of poet and biographer Hermann Hagedorn. Correspondence in the collection consists of letters to and from family, friends, other writers, publishers, scholars, and well-known political and cultural figures from the first half of the twentieth century. Noteworthy correspondents include Stephen Vincent Benét, Albert Einstein, Robert Frost, Percy MacKaye, Ezra Pound, Edwin Arlington Robinson, and Albert Schweitzer, as well as Theodore ("Teddy"), Franklin D., and Eleanor Roosevelt. Writings include drafts and research materials for articles, plays, poems, short stories, speeches, and biographical works. In addition, there are clippings on Hagedorn and reviews of his literary and biographical works. Other materials include medals, music, photographs, printed materials, and a scrapbook.
The collection features material documenting Hagedorn's research on Theodore Roosevelt and his work with the Theodore Roosevelt Association.