zaidun-leeng sdn bhd is one of the six companies in zaidun-leeng sdn bhd group covering malaysia, singapore and brunei darussalam. the remaining five companies are perunding uzl sdn bhd in kuching, zaidun-leeng (sabah) sdn bhd in kota kinabalu, leeng consultants pte ltd in singapore and jurutera perunding lce and boltan hennessy sdn bhd in bandar seri bagawan. for highway projects the associate firms are perunding zaini khoo dan rakan-rakan sdn bhd and isotech consult. the group had its origin in the firm of keith edmonds associates, which was established in kuala lumpur in 1957 to provide consultancy engineering services for iron ore exploitation.