Claim: Usually belonging in the Pakistan Administrative Service, the Principal Secretary to the President of Pakistan is currently Tariq Najmi while the longest serving one in history was ace bureaucrat Qudrat Ullah Shahab.
Evidence: The position holder usually belongs to the Pakistan Administrative Service. The current Principal Secretary to the President is Tariq Najmi. The longest serving Principal Secretary to the President was ace bureaucrat Qudrat Ullah Shahab, who served with three heads of state.