Chief of the acaryas
Sri Caitanya-caritamrta
CC Adi-lila
When the Lord, in His ecstasy of Baladeva, was moving as if intoxicated by the beverage, Advaita Ācārya, the chief of the ācāryas [ācārya śekhara], saw Him in the form of Balarāma
CC Adi 17.118, Translation: When the Lord, in His ecstasy of Baladeva, was moving as if intoxicated by the beverage, Advaita Acarya, the chief of the acaryas [acarya sekhara], saw Him in the form of Balarama.
CC Madhya-lila
The chief acarya of the Tattvavada community was very learned in the revealed scriptures. Sri Caitanya Mahaprabhu humbly questioned him
CC Madhya 9.254, Translation: The chief acarya of the Tattvavada community was very learned in the revealed scriptures. Sri Caitanya Mahaprabhu humbly questioned him.