  We construct a period mapping for deformations of a differential graded
algebra, that generalizes Griffiths' period mapping. It is constructed as a
morphism between differential graded Lie algebras which has a moduli-theoretic
interpretation, where the domain of the morphism is the shifted Hochschild
cocohain complex. We then use this period mapping to give some applications
such as unobstructedness of deformations.
