  We present our recent efforts to unveil and understand the origin of massive
stars outside the three massive star clusters in the Galactic Center. From our
HST/NICMOS survey of the Galactic Center, we have identified 180 Paschen-alpha
emitting sources, most of which should be evolved massive stars with strong
optically thin stellar winds. Recently, we obtained Gemini GNIRS/NIFS H- and
K-band spectra of eight massive stars near the Arches cluster. From their
radial velocities, ages and masses, we suggest that in our sample, two stars
are previous members of the Arches cluster, while other two stars embedded in
the H1/H2 HII regions formed in-situ.
