The general features of the process of photo-meson production are discussed on a semiclassical basis and also on the basis of perturbation theory in the weak coupling approximation applied to scalar, pseudoscalar, vector, and pseudovector meson theory. These calculations are carried out with the Feynman-Dyson methods to give covariant expressions for the cross sections. The corrections of next higher order in the meson-nucleon coupling are calculated for pseudoscalar mesons and are shown to give large contributions. Comparison of the conclusions of the theory with the experimental results seems to indicate that the meson is of spin zero and is closely bound to the nucleons as is characteristic of pseudoscalar theory.