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We describe the design and data sample from the DEEP2 Galaxy Redshift Survey,the densest and largest precision-redshift survey of galaxies at z ~ 1completed to date. The survey has conducted a comprehensive census of massivegalaxies, their properties, environments, and large-scale structure down toabsolute magnitude M_B = -20 at z ~ 1 via ~90 nights of observation on theDEIMOS spectrograph at Keck Observatory. DEEP2 covers an area of 2.8 deg^2divided into four separate fields, observed to a limiting apparent magnitude ofR_AB=24.1. Objects with z < 0.7 are rejected based on BRI photometry in threeof the four DEEP2 fields, allowing galaxies with z > 0.7 to be targeted ~2.5times more efficiently than in a purely magnitude-limited sample. Approximatelysixty percent of eligible targets are chosen for spectroscopy, yielding nearly53,000 spectra and more than 38,000 reliable redshift measurements. Most of thetargets which fail to yield secure redshifts are blue objects that lie beyond z~ 1.45. The DEIMOS 1200-line/mm grating used for the survey delivers highspectral resolution (R~6000), accurate and secure redshifts, and uniqueinternal kinematic information. Extensive ancillary data are available in theDEEP2 fields, particularly in the Extended Groth Strip, which has evolved intoone of the richest multiwavelength regions on the sky. DEEP2 surpasses otherdeep precision-redshift surveys at z ~ 1 in terms of galaxy numbers, redshiftaccuracy, sample number density, and amount of spectral information. We alsoprovide an overview of the scientific highlights of the DEEP2 survey thus far.This paper is intended as a handbook for users of the DEEP2 Data Release 4,which includes all DEEP2 spectra and redshifts, as well as for thepublicly-available DEEP2 DEIMOS data reduction pipelines. [Abridged]

The DEEP2 Galaxy Redshift Survey: Design, Observations, Data Reduction, and Redshifts