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The Echellette Spectrograph and Imager (ESI) is a visible-wavelength, faint-object, imager and single-slit spectrograph in operation at the Cassegrain focus of the Keck II telescope since 1999. ESI was designed and built at UCO/Lick Observatory under the leadership of Principal Investigator J. S. Miller and Project Manager Dave Cowley. Notable features of ESI include:

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Principal Investigator: Joe Miller (UCO/Lick) ESI Reference (via ADS)
Sheinis et al. 2002, PASP, 114, 851.
Project Manager: Dave Cowley (UCO/Lick)