After completing his studies, Hasan became the principal of Madrasa Qasmia, an Islamic school established by his teacher Nanautawi in Khurja.[6][7] He then served in the Islamic institutions in Delhi and Sambhal as a principal, the institutions being likely Madrasa Abdur-Rab, Delhi; and Madrasa Jama Masjid, Sambhal.[5][6] He became the principal of Madrasa Shahi in Moradabad upon its inception it 1879 (1296 AH), a post he served until 1885 (Dhu al-Qadah 1303 AH).[5] Later, he moved to Amroha, where he re-established an old madrasah in the Jama Masjid,[a] and occupied himself with the teaching responsibilities, and served as the first rector, principal and senior hadith professor.[5][9][10] Few years later, the executive council of Darul Uloom Deoband, called him to teach at the seminary. He taught there for just two months and then moved back to Amroha.[11] His students included Ismail Sambhali.[12]
Hasan was a member of the executive council of the Darul Uloom Deoband from 1895 to 1912.[13] He was a founder members of Mahmud Hasan Deobandi's Thamratut-Tarbiyyat.[5] He debated with Arya Samaj people and was among the prominent Muslim scholars who debated Ahmadis.[14] On 15 June 1909, he debated with Ahmadis in Rampur alongside Sanaullah Amritsari, and defeated them.[15] His literary works include Ifādāt-e-Aḥmadiyyah, Izālatul Waswās and Al-Ma'lūmāt al-Ilāhiyyah.[3] He was a jurist and his religious edicts are found in the libraries of Phalauda and Rampur.[3]
^This is now known as Madrasa Islamia Amroha or Jamia Islamia Arabia Amroha, and is among the prominent Islamic institutions in India. It was earlier established by Muhammad Qasim Nanautawi.[8]
Fareedi, Naseem Ahmad (January 2000). "Hadhrat Mawlānā Sayyid Ahmad Hasan Muhaddith Amrohi". In Deobandi, Nawaz (ed.). Sawaneh Ulama-e-Deoband (in Urdu). Vol. 2. Deoband: Nawaz Publications. pp. 366–430.
Mansoorpuri, Salman (2014). Tehreek Azadi-e-Hind Mai Muslim Ulama aur Awaam ka Kirdar (in Urdu). Deoband: Deeni Kitab Ghar. pp. 156–157.
Qasmi, Muhammad Tayyib (July 1999). Bukhari, Akbar Shah (ed.). 50 Misaali Shaksiyaat [50 Exemplar personalities] (in Urdu). Deoband: Maktaba Faiz-ul-Qur'an. pp. 50–633.
Rizwi, Syed Mehboob (1981). History of the Dar al-Ulum Deoband. Vol. 2. Translated by Murtaz Husain F Quraishi. Deoband: Darul Uloom Deoband. pp. 23–26.
Qāsmi, Muḥammadullah (October 2020). Darul Uloom Deoband ki Jami' wa Mukhtasar Tārīkh (in Urdu) (2 ed.). Deoband: Shaykhul Hind Academy. pp. 564–565.
Fareedi, Naseem Ahmad (2009). al-Haqq, Muhib (ed.). Sayyid al-Ulama [The Leader of the Scholars] (in Urdu). Amroha: Jamia Islamia Arabia.