Hazrat Qari Amir Hasan Sahab (DB) has Permissions from:
(1) Hazrat Maulana Muhammed Zakaria Kandhalwi (NM)
(2) Hazrat Shaikh Hakim Muhammed Kalimullah Sahab (DB).
In between he had an association with Mufti Mehmood Hasan sahab (RA), whose final resting place is in South Africa. As the Head Master (Sadar Mudarris)of Ashraful Madaris, Hardoi, UP, India he has enjoyed an extended company of Muhi-us-Sunnah Hazrat Shah Abrar-ul-Haq Sahab (NM).
(Ref: A Query at Sunni Forums)