He received his military training in an elite infantry battalion of the Baloch Regiment (Sarbakaf 12) and demonstrated exceptional professionalism and skill early on in his career.
Later, he became the chief of staff in an important corps in Gujranwala before his promotion to major general and posting to the prestigious division guarding the frontier in the Siachen and Kargil sectors - the Force Command Northern Area (FCNA).
During his six-year tenure as Chairman of WAPDA from 2016 to 2022, Lt. General Muzammil Hussain oversaw an unprecedented transformation of the organization, which significantly improved Pakistan's energy and water sectors.
[9] The issuance marked a major milestone in Pakistan's financial history, making WAPDA the first Pakistani parastatal to raise foreign investment without government guarantees and without pledging any assets.
His efforts to complete large-scale hydropower and water storage projects have significantly improved Pakistan's energy security, while his innovative initiatives in modernizing WAPDA's operations have helped increase efficiency and transparency in the organization's functioning.
In light of his contributions, Lt. General (R) Muzammil Hussain, former chairman of WAPDA, was invited to deliver the keynote address at the closing session of the 27th Congress of the International Commission on Large Dams (ICOLD).
ICOLD is an organization dedicated to the exchange of professional information, knowledge, and standards related to the design, construction, maintenance, and impact of large dams.
[10] In 2022, NAB initiated an unfounded inquiry based on an “unconfirmed complaint” on Tarbela 4th Extension against the Former Chairman WAPDA, citing misuse of authority and loss to the government exchequer.
The inquiry is widely regarded as baseless as the project, funded by World Bank, was successfully completed and in compliance with the agency's strict operational guidelines.