There are four transcendental schools ( Sampradayas ) that teach pure Devotion to the Supreme

1. Brahma Sampradaya beginning from Brahma after His initiation from the Personality of Godhead
2. Rudra Sampradaya beginning from Sankara or Mahadeva
3. Sri Sampradaya beginning from Srimati Laxmi Devi the Eternal Consort of Sri Narayana
4. Kumar Sampradaya beginning from the Kumars namely Sanak, Sanat, Sanatan and Kumars.
 

• Sree Madhyacharya belonged to Brahma Sampradaya
• Sree Ramanuja belonged to the Sree Sampradaya
• Sree Vishnuswami belonged to the Rudra Sampradaya
• Sree Nimbaditya Acarya belonged to Kumar Sampradaya

All these four Acharyas are bona fide preachers of the pure transcendental philosophy dealing with the problems of the world, living entities and the Supreme Personality of Godhead who is the cause of the creation as well as the living entities,  who falsely try to dominate over the creation and the controlling energy known as the material Nature.