1) Biographer 
• (n.) One who writers his own life or biography.
Au`to·bi·og'ra·pher noun [ Auto- + biographer .] One who writers his own life or biography. 
[n] - someone who writes their own biography
autobiographer Someone who writes about his or her personal life history. An autobiographer is someone who describes his many interesting experiences, some of which are possibly true. —Anonymous
noun someone who writes their own biography