  The Near-Infrared Spectrograph (NIRSpec) is one of the four focal plane
instruments on the James Webb Space Telescope which was launched on Dec. 25,
2021. We present an overview of the as-run NIRSpec commissioning campaign, with
particular emphasis on the sequence of activities that led to the verification
of all hardware components of NIRSpec. We also discuss the mechanical, thermal,
and operational performance of NIRSpec, as well as the readiness of all NIRSpec
observing modes for use in the upcoming JWST science program.
