Majeed was also one of the founding members of Sultan Bashiruddin Mahmood's Ummah Tameer-e-Nau organisation; an NGO which caused an international embarrassment for Pakistan.
In 1964, Majeed went to Belgium on a scholarship awarded by PAEC and attended Katholieke Universiteit Leuven, from which he received his Doctor of Science (D.Sc.)
[1] As a senior scientist he had access to classified documentation on sensitive plutonium technology which is critical to develop a nuclear weapon.
At ICTP, Majeed taught advanced courses in chemistry and mathematics, and published numerous research papers in the field of spectroscopy, neutron and particle detectors.
[3] Majeed was also a part of a team at the New Labs that had succeeded in attaining fresh supplies of weapons-grade plutonium isotopes, produced by the reactor.
He published extensively in the 1980s and 1990s on nuclear detectors and the use of x-ray diffraction, fluorescence, and crystallography to study a wide variety of materials and elements, including stainless steel, uranium, plutonium, and thorium.
Along with fellow nuclear scientist Sultan Bashiruddin Mahmood, he was arrested in October 2001 in Islamabad by a joint-operation of the Inter-Services Intelligence and the Federal Investigation Agency, because of their connections to the Taliban.
The FIA and ISI's joint-Intelligence report, which was given to the Parliament's Committee on National Security and Defence Affairs, stated that Majeed admitted that Osama bin Laden had asked them to build either a radiological or a biological weapon.