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The past few years have seen a tremendous increase in our knowledge of
the galaxy population at z&*lt;3. Recently it was found that red galaxies
make up more than 2/3 of the most massive galaxies in this redshift
range. As most of these galaxies are beyond the limits of optical
spectroscopy they are underrepresented in available spectroscopic
samples of high redshift galaxies. To obtain a full spectroscopic census
of the universe at z~2.5 we have performed a near-infrared spectroscopic
survey of an unbiased, K-selected sample with GNIRS on Gemini-South. I
will present the results of this program and follow-up SINFONI integral
field spectroscopy, Spitzer and NICMOS imaging, and discuss the
implications for the formation of massive galaxies.
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