Gusainji was the younger son of Vallabhacharya. His real name was Vitthalnath. He was born in 1516

at Charnat near Varanasi

Varanasi

-Etymology:The name Varanasi has its origin possibly from the names of the two rivers Varuna and Assi, for the old city lies in the north shores of the Ganga bounded by its two tributaries, the Varuna and the Asi, with the Ganges being to its south...

. Gusainji as Vithalnathji is mentioned in Hindu scriptures as follows: In Agni Purana

Agni Purana

The Agni Purana, one of the 18 Mahapuranas, a genre of Hindu religious texts, contains descriptions and details of various incarnations of Vishnu. It also has details account about Rama, Krishna, Prithvi, and the stars...

, in a chapter titled "Bhavishiyotar" (Future Avatar

Avatar

In Hinduism, an avatar is a deliberate descent of a deity to earth, or a descent of the Supreme Being and is mostly translated into English as "incarnation," but more accurately as "appearance" or "manifestation"....

 (birth)), God himself professed that: "In future I will come as son of Shree Vallabh and I will be known as Shree Vithal."

Gusainji led the sect Pushtimarg

Pushtimarg

Pushtimarg is a sect of the Hindu religion, founded by Shrimad Vallabhacharya around 1500 AD.Shri Vallabhacharya is one of the five main Acharyas of the Hindu Religion...

, the sect founded by his father after the latter's death. Based on the order of Shrinathji

Shrinathji

Shrinathji is an anthropomorphic form of Hindu god Krishna, manifest as a seven year old child . The principal shrine of Shrinathji is situated at the temple town of Nathdwara, located 48 Kilometers North-east of Udaipur city in Rajasthan...

 (Krishna

Krishna

Krishna is a central figure of Hinduism and is traditionally attributed the authorship of the Bhagavad Gita. He is the supreme Being and considered in some monotheistic traditions as an Avatar of Vishnu...

's image currently residing in Nathadwara near Udaipur - Rajashtan - India), Gusainji included variation of Bhog (feasts & meals), Raag (music) and Shringaar (adorations) into the seva (day to day services) of Shrinathji (श्रीनाथजी).