  We present optical and near-infrared broadband photometry and optical spectra
of AT 2014ej from the the Carnegie Supernova Project-II. These observations are
complemented with data from the CHilean Automatic Supernova sEarch, the Public
ESO Spectroscopic Survey of Transient Objects, and from the Backyard
Observatory Supernova Search. Observational signatures of AT 2014ej reveal that
it is similar to other members of the gap-transient subclass known as luminous
red novae (LRNe), including the ubiquitous double hump light curve and spectral
properties akin to the LRN SN 2017jfs. A medium-dispersion, visual-wavelength
spectrum of AT 2014ej taken the Magellan Clay telescope, exhibits a P Cygni
H$\alpha$ feature characterized by a blue velocity at zero intensity of
$\approx 110$ km s$^{-1}$ and a P Cygni minimum velocity of $\approx70$ km
s$^{-1}$, and which we attribute to emission from a circumstellar wind.
Inspection of pre-outbust Hubble Space Telescope images yields no conclusive
progenitor detection. In comparison with a sample of LRNe from the literature,
AT 2014ej lies among the brighter end of the luminosity distribution.
Comparison of the ultra-violet, optical, infrared (UVOIR) light curves of
well-observed LRNe to common-envelope evolution models from the literature,
indicates the models under predict the luminosity of the comparison sample at
all phases and also produce inconsistent time-scales of the secondary peak.
Future efforts to model LRNe should expand upon the current parameter space
explored and therefore may consider more massive systems and a wider range of
dynamical timescales.
