Willis Towers Watson (WTW) has announced the appointment of Leng Leng Ng as country leader for Singapore, in addition to her current position as head of corporate risk and broking (CRB) in Singapore. She takes over the position held by Vivek Nath, who will move to head WTW's CRB business in South and Southeast Asia. He will operate in a dual capacity as head of South Asia. WTW's South Asia business encompasses countries in ASEAN and the Indian sub-continent.