We review the current status and future prospect for probing the transverse
momentum dependent (TMD) parton distributions using the Drell-Yan process. We
focus on the Boer-Mulders and Sivers functions, which are expected to undergo a
sign-change from semi-inclusive deep-inelastic scattering (SIDIS) to Drell-Yan
process. The constraints of existing Drell-Yan and SIDIS experiments on the
signs of these functions are discussed. Future Drell-Yan measurements for the
TMDs are also presented.Comment: 7 pages, 4 figures, Proceedings for the "Transversity 2014" Worksho
