  We are using adaptive optics on Keck and the VLT to probe the dynamics and
star formation in Seyfert and QSO nuclei, obtaining spatial resolutions better
than 0.1" in the H- and K-bands. The dynamics are traced via the 2.12um H_2
1-0S(1) line, while the stellar cluster is traced through the CO 2-0 and 6-3
absorption bandheads at 2.29um and 1.62um respectively. Matching disk models to
the H_2 rotation curves allows us to study nuclear rings, bars, and warps; and
to constrain the mass of the central black hole. The spatial extent and
equivalent width of the stellar absorption permits us to estimate the mass of
stars in the nucleus and their contribution to the emission. Here we report on
new data for I Zwicky 1, Markarian 231, and NGC 7469.
