A personal historian can be thought of as a facilitator; one who aids in getting life stories into appropriate formats for sharing.   A history can be prepared in written, audio or video formats.  It can be a collection of stories, a tribute, a memoir, a biography, an autobiography, or even a collection of letters.  The final result can be as casual as a notebook or as polished as a hardback book.  It may include photos or other memorabilia or just text.