Thanpuying Lursakdi Sampatisiri (20 February 1919 – 9 November 2010; Thai: เลอศักดิ์ สมบัติศิริ; RTGS: Loesak Sombatsiri; Thai pronunciation: [lɤːsàk sǒmbàtsìrì]) was the daughter of Nai Lert Sreshthaputa and the only heir of the business and real estate empire, founded in 1894, known as Nai Lert Group.

When Sampatisiri was a young woman (1930s), her father sent her to Japan, because he predicted that economic power would be centered there in her generation.

Sampatisiri's father died suddenly, when she was 27 years old, and she found herself at the helm of his business empire which included the White Bus Company which dominated the Bangkok's transport routes (including its canals) and the ice factories which supplied the majority of the city's population.

[5][6][7] Khun Binich, himself, served as the Chief of the Traditional Arts Division of the Department of Fine Arts at the Ministry of Education for The Royal Thai Government and was a frequent host to overseas visitors and celebrities, being known for his sense of hospitality and entertainment (US comic Joey Adams mentions his encounter with Khun Binich in his book On The Road for Uncle Sam).

Unfortunately and suddenly, in 1975, the carefully planned expansion of the transport business was swept away overnight by the chaos of Thai politics.