2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/10860Gravitational lenses are a unique new constraint on the structure of galaxies. We review the evidence that most lenses are early-type galaxies, the optical properties of the lens galaxies, the evidence against constant M/L models, recent work on the axis ratios of the mass distribution, and the role stellar dynamics plays in gravitational lensing.10 pages, 6 figures Proc. of the Second Stromlo Symposium, The Nature of Elliptical GalaxiesAstrophysicstext