  The photoionization of the four-electron beryllium-like isoelectronic series
from the neutral to Fe^{+22} has been studied for ground ^1S and metastable ^3P
initial states. The wave functions of the final-state (target) ions were built
using the CIV3 code. Both nonrelativistic LS-coupling R-matrix and relativistic
Breit-Pauli (BP) R-matrix methods were used to calculate the cross sections in
the photon-energy range between the first ionization threshold and the 1s^2
4f_{7/2} threshold for each ion. Our total cross sections compare well with
experiment which is available for Be, B^+, C^{+2}, N^{+3}, and O^{+4}. The
agreement between the present work and previous calculations is discussed in
detail. The importance of relativistic effects is seen by the comparison
between the LS and the BP results.
