Syed Mir Masud Ahmad was born on 1 September 1927, to Hazrat Mir Muhammad Ishaq (ra). He got his education from Madrasa-e-Ahmadiyya. He passed the exam of Maulvi Fazil and also got the Shahid degree. Moreover, he passed M.A. in Islamiat. He joined Nizaam-e-Wasiyyat in 1945. 

He was married to Sahibzadi Amatur Rauf, daughter of Sahibzada Mirza Mansoor Ahmad. He was the brother-in-law of Hazrat Mirza Masroor Ahmad (aa), Khalifatul Masih V. Allah the Almighty blessed Syed Mir Masud Ahmad with four sons. 

He devoted his life on 23 February 1952. After serving in Nazarat Da’wat Ilallah for some time, he served in Wakalat Tijarat Tahrik-e-Jadid. 

In 1955, he was appointed as Naib Wakil-ud-Diwan. 

In 1962, he went to Denmark as a Murabbi (missionary), and when he returned three years later, at first he was appointed Naib Wakil-ud-Diwan, and then Wakil-ud-Diwan. 

In 1969, he was again sent to Denmark and returned in 1973. 

In 1975, he was posted to Switzerland, from where he was sent to Denmark about a year and a half later and remained there until December 1982. 

When he came to Rabwah, he was appointed as Wakil Centenary Celebrations, where he worked until 1992. 

Since 1 August 1992, he had served as the supervisor of the Mutakhassasin. He had been a member of Majlis Tahrik-e-Jadid as well.

He passed away on 23 December 2002 in Rabwah at the age of 75.