Datuk Haji Mohd Haniff bin Haji Koslan began his career as a Tax Assistant with Inland Revenue Board of Malaysia in 1980. He then became a Tax Consultant with Messrs. K.K San Liew & Loke from 1984 to 1986 and Messrs. Aidid & Co from 1986 to 1989. He was the Executive Directors of Kumpulan KKHM Sdn Bhd from 1989 to 1997 and Bridgecon Holdings Berhad from 1997 to 1998. From 1998 to 2000, he was the President of Ranhill Corporation Sdn Bhd.

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