Anion photoelectron spectroscopy and density functional theory computations were conducted on the 2-hydroxypyridine/2-pyridone tautomeric dimer anion system. Their experimentally-measured, composite vertical detachment energy (VDE) of 1.21 +/- 0.05 eV compares well with their theoretically-determined VDE values of 1.15 eV and 1.20 eV, supporting our conclusion that intermolecular electron-induced proton transfer (EIPT) has taken place in these dimer anions.