Sri Vallabha Acharya (1479 - 1531) was a devotional philosopher, who founded the Pushti sect in India, and the philosophy of Shuddha advaita (Pure Non-dualism). He is regarded as an acharya and guru within the Vaishnava traditions. Within Indian Philosophy he is known as the writer of sixteen 'stotras' (tracts) and produced several commentaries on the Bhagavata Purana, which describes the many lilas (pastimes) of the avatar, Krishna. Wikipedia
Acharya Hanumant was representing Vishithadvaita of Ramanuja; Acharya Vyastirtha was seated to represent Dvaita of Madhva, of Nimbarka sect was present Keshavabhatta, and Sri Vidyatirtha was to represent Mayavada of Shankara. www.geocities.com/neovedanta/a82.html
Vallabha was contemporary of Chaitannya Mahaprabhu of Bengal and both of them dedicated their lives for the spread of bhakti path to realize God. Probably that must be the need of the time for the two great souls to come to earth simultaneously. www.boloji.com/hinduism/012.htm
The definitive Wikipedia entry for Vallabha Acharya. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Vallabha_Acharya