Unless stated otherwise, the fatwas and answers to questions are taken from the writings of Hazrat Maulana Ahmad Sadeq Desai (Damat Barakatuhum) who is a khalifah of Shaykh Maseehullah Khan (rahmatullahi alayh), one of the foremost khalifahs of the great Mujaddid Shaykh Ashraf Ali Thanwi (rahmatullah alayhi) (d.1943). The articles authored by “Mujlisul Ulama” are also by him. There’s some more information regarding him here.
The impact of the work of the Akaabir Ulama of Deoband in terms of their reformation of hundreds of millions of Muslims throughout the world, their scholarly contribution to every science of Deen – Fiqh, Hadith, Tafseer, etc. and their status as flag-bearers of every effort of Deen – Tasawwuf, Jihaad, Tableegh, etc. bears ample testimony to the fact that they were amongst those Mujaddids (Revivers) whom Allah (azza wa jal) sends periodically in order to revive the original pristine teachings of the Deen – their status as Mujaddids also recognised by accepted authorities in Sunni scholarship in the Arab world such as Allamah Kawthari.
The great Arab scholar, Shaykh Abdul Fattah Abu Ghuddah, succinctly described their revival work at the time, when their impact had yet to pervade the furthest reaches of the world:
“The great madrasah of Deoband is [like] a radiant sun that has illuminated various parts of India. It revived the Prophetic way (sunnah) academically, practically and in terms of suluk, and it removed the darkness of innovation (bid’ah), which had amassed in those lands for a lengthy time. It stripped the pools of knowledge and shari’ah from all that was alien to them in the same way that it stripped the suluk of the Sufis from new customs — such as sama’ and stringed instruments and their like from the gatherings of bid’ ah that were prevalent in India in those days.
It replaced those innovations with clear and radiant sunnah — in terms of teaching and studying, suluk and propagation — until it (the madrasah) became a powerful, great and authentic source of light from which came droves of god-fearing (rabbaniyyin) ulama, who combined the excellence of knowledge and action (’amal), while adhering to the sunnah and eliminating bid’ah.”