"Performance and Results of NIRSPEC on the Keck Telescope" Ian S. McLean, Professor Dept. Physics & Astronomy, UCLA Director, Infrared Imaging Detector Lab Abstract: It is almost 3 years ago to the day that NIRSPEC obtained first light on the Keck II 10-meter telescope. The instrument is a cryogenic echelle spectrometer for the near infrared and is one of the most heavily used Keck instruments. I will briefly review its properties and the challenges faced in building it. I will also describe some of its most interesting scientific achievements, with an emphasis on my own applications to a Brown Dwarf Spectroscopic Survey.