  Results of a relativistic model for pion- and photon-induced reactions on the
proton are presented. The model is crossing symmetric and gauge invariant. The
nucleon resonances P_11 (1440), P_11 (1710), D_13 (1520), S_11 (1535), S_11
(1650), P_33 (1232), P_33 (1600), S_31 (1620), and D_33 (1700) have been
included explicitly in the calculation. Unitarity within the channel space \pi
N + \gamma N below the two-pion production threshold has been achieved by using
the K-matrix approach. Strong and electromagnetic coupling parameters of the N*
resonances have been determined from a fit to the pion-nucleon phase shifts,
pion-photoproduction multipoles and Compton-scattering cross sections. The
model is shown to describe simultaneously most of the available data. Results
for the electric and magnetic polarizabilities of the nucleon are presented.
