From 1998 to 2000, he worked as a visiting part-time Lecturer in the Law College at Gomal University, Dera Ismail Khan.

Mazhar Alam Miankhel, during his tenure, expressed concerns and raised important observations regarding the actions of President Arif Alvi, former Prime Minister Imran Khan, and other leaders of the Pakistan Tehreek-e-Insaf (PTI) party.

In his additional note on the SC's judgment on the deputy speaker of the National Assembly's ruling to dismiss the no-trust resolution against Imran Khan, Justice Miankhel pointed out that the exercise of authority was violated and the trust was breached by these individuals.

[6] He called upon the parliament to consider invoking Article 6 of the constitution, which pertains to high treason, against President Alvi, PTI chief Imran Khan, former speaker of the assembly Asad Qaiser, former deputy speaker Qasim Suri, and former law minister Fawad Chaudhry.

[2] On 19 July 2024, his name was considered by the Judicial Commission of Pakistan (JCP) for an appointment as an ad-hoc judge of the Supreme Court.