  (abridged) We present Gemini integral-field unit (IFU) spectroscopy and
Hubble Space Telescope (HST) F435W- and F814W-band images of a new four-image
gravitational lens, SDSSJ140228.22+632133.3, obtained as part of an HST
Snapshot program designed to expand the sample of known gravitational lenses
amenable to detailed photometric, lensing, and dynamical studies. The lens is a
smooth elliptical galaxy at a redshift of z_l = 0.2046 +/- 0.0001 with a Sloan
r-band magnitude of 17.00 +/- 0.05 and a stellar velocity dispersion of 267 +/-
17 km s^-1, obtained from its SDSS spectrum. Multiple emission lines place the
quadruply-imaged source at a redshift of z_s = 0.4814 +/- 0.0001. The
best-fitting singular isothermal ellipsoid lens model gives an Einstein radius
b = 1.35" +/- 0.05" (or [4.9 +/- 0.2] h_65^-1 kpc), corresponding to a total
mass of (30.9 +/- 2.3) x 10^10 h_65^-1 M_sun within the critical curve. In
combination with HST photometry this gives a rest-frame B-band mass-to-light
ratio of (8.1 +/- 0.7) h_65 times solar within the same region. The lens model
predicts a luminosity-weighted stellar dispersion within the 3"-diameter SDSS
aperture of sigma_* ~= 270 km s^-1, in good agreement with the observed value.
Using the model to de-lens the four lensed images yields a source with a
smooth, monotonically-decreasing brightness distribution.
