Many of Lee's family have important positions in Singaporean society, and his children hold high government or government-linked posts. His elder son Lee Hsien Loong, a former Brigadier General, has been the Prime Minister since 2004. He is also the Deputy Chairman of the Government of Singapore Investment Corporation (GIC), of which Lee himself is the chairman. Lee's younger son, Lee Hsien Yang, is also a former Brigadier General and is a former President and Chief Executive Officer of SingTel, a pan-Asian telecommunications giant and Singapore's largest company by market capitalisation (listed on the Singapore Exchange, SGX). Fifty-six percent of SingTel is owned by Temasek Holdings, a prominent government holding company with controlling stakes in a variety of very large government-linked companies such as Singapore Airlines and DBS Bank. Temasek Holdings was until 2009 run by Executive Director and C.E.O. Ho Ching, the wife of Lee Hsien Loong. Lee's daughter, Lee Wei Ling, runs the National Neuroscience Institute. Lee's wife, Kwa Geok Choo, used to be a partner of the prominent legal firm Lee & Lee.