  We propose a nonlocal field theory for gravity in presence of matter
consistent with perturbative unitarity, quantum finiteness, and other essential
classical properties that we are going to list below. First, the theory exactly
reproduces the same tree-level scattering amplitudes of Einstein's gravity
coupled to matter insuring no violation of macro-causality. Second, all the
exact solutions of the Einstein's theory are also exact solutions of the
nonlocal theory. Finally, and most importantly, the linear and nonlinear
stability analysis of the exact solutions in nonlocal gravity (with or without
matter) is in one to one correspondence with the same analysis in General
Relativity. Therefore, all the exact solutions stable in the Einstein's theory
are also stable in nonlocal gravity in presence of matter at any perturbative
order.
