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compositions, their ages, and their motions. The Milky Way provides an ideal case for performing detailed Galactic archaeology to investigate the evolution of spiral galaxies. The SDSS-APOGEE spectroscopic survey, using a high-resolution, multi-object NIR spectrograph, has observed ~150,000 stars in the Galaxy, with particular emphasis on red giants in the Kepler and K2 fields and in the dust-obscured regions of the disk and bulge. I will discuss how we are using spectroscopic and asteroseismic results to measure age and metallicity gradients, the prevalence of radial mixing of stars in the disk, and the origin of chemically peculiar populations in our Galaxy.