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Much progress has been made in measuring black hole (BH) masses in(non-active) galactic nuclei using the tight correlation between stellarvelocity dispersions (sigma) in galaxies and the mass of their central BH. Theuse of this correlation in quasars, however, is hampered by the difficulty inmeasuring sigma in host galaxies that tend to be overpowered by their brightnuclei. We discuss results from a project that focuses on z~0.3 quasarssuffering from heavy extinction at shorter wavelengths. This makes it possibleto obtain clean spectra of the hosts in the spectral regions of interest, whilebroad lines (like H-alpha) are still visible at longer wavelengths. We compareBH masses obtained from velocity dispersions to those obtained from the broadline region and thus probe the evolution of this relation and BH growth withredshift and luminosity. Our preliminary results show an offset between theposition of our objects and the local relation, in the sense that red quasarshave, on average, lower velocity dispersions than local galaxies. We discusspossible biases and systematic errors that may affect our results.

Quasar Black Hole Masses from Velocity Dispersions