I think most serious writers, certainly in the modern period, use their own lives or the lives of people close to them or lives they have heard about as the raw material for their creativity.
Chaim PotokA non-fiction writer pretty much has the shape of the figure in front of him or her and goes about refining it. A work of non-fiction is not as difficult to write as a work of fiction, but it's not as satisfying in the end.
Chaim Potok