  We report on the observation of the eta_c^' (2 ^1S_0), the radial excitation
of eta_c (1 ^1S_0) ground state of charmonium, in the two-photon fusion
reaction gamma gamma to eta_c^' to K_S^0 K^{\pm} pi^{\mp} in 13.4 fb^{-1} of
CLEO II/II.V data and 9.2 fb^{-1} of CLEO III data. The data have been analyzed
to extract the eta_c^' resonance parameters.
