RUPA GOSVAMI is known as bhakti-rasacarya, the expert in the tastes of pure devotional service. He and his elder brother, Srila Sanatana Gosvami, left high posts in the government of Nawab Hussein Shah to join Sri Caitanya Mahaprabhu. Empowered by Lord Caitanya, Srila Rupa Gosvami wrote many books about the science of Krsna consciousness. A summary study of his Bhakti-rasasmrta-sindhu is available as "The Nectar of Devotion," and his Upadesamrta is available as "The Nectar of Instruction".
(See Sri Caitanya-caritamrta, Adi-lila 10.84, Madhya-lila 1.36- 41, Madhya-lila chapter 19, and Antya-lila chapter 1.)