  The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory
is the first accelerator facility that can accelerate, store and collide spin
polarized proton beams. This development enables a physics program aimed at
understanding how the spin of the proton results from its quark and gluon
substructures. Spin states that are either parallel (longitudinal) or
perpendicular (transverse) to the proton momentum reveal important insight into
the structure of the proton. This talk outlines future plans for further
studies of transverse spin physics at RHIC.
