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The observational link between Supermassive Black Holes (SMBH) and galaxiesat low redshift seems to be very tight, and statistically the global evolutionof star formation activity and BH accretion activity also seem to trace eachother closely. However, pinning down the co-evolution of galaxies and BH on anobject-by-object basis remains elusive. I present results from new models forthe joint evolution of galaxies, SMBH, and AGN, which may be able to helpresolve some of the observational puzzles. A unique aspect of these models isour treatment of self-regulated BH growth based on hydrodynamic simulations ofgalaxy-galaxy mergers. Although these models do quite well at reproducing theobserved evolution of galaxies, they do not reproduce the observed history ofBH accretion, predicting too much early accretion and not enough at late times.I suggest two possible resolutions to this problem.

The Co-evolution of Galaxies, Black Holes, and AGN in a Hierarchical Universe