  We argue that the resonant peak observed in neutron scattering experiments on
superconducting cuprates and the peak/dip/hump features observed in ARPES
measurements are byproducts of the same physical phenomenon. We argue that both
are due to feedback effects on the damping of spin fluctuations in a $d-$wave
superconductor. We consider the spin-fermion model at strong coupling, solve a
set of coupled integral equations for fermionic and bosonic propagators and
show that the dynamical spin susceptibility below $T_c$ possesses the resonance
peak at $\Omega_{res} \propto \xi^{-1}$.
  The scattering of these magnetic excitations by electrons gives rise to a
peak/dip/hump behavior of the electronic spectral function, the peak-dip
separation is exactly $\Omega_{res}$.
