He was with Aljeffri, Siva, Heng and Monteiro from 1980 to 1981 and Baharom Hamdan from 1981 to 1984. He then set up his own Chartered Accountants firm, Leou & Associates, in 1988 and Leou Associates PLT, in 2015. He serves as a partner of both the firm. He also sits on the boards of directors of Degem Berhad, Asiamet Education Group Berhad, Sern Kou Resources Berhad and Menang Corporation (M) Berhad.