Wikipedia is quite informative these days:
Kwong Sai Jook LumAccording to oral traditions, the Kwong Sai Jook Lum (江西竹林) style traces its origins to the temple Jook Lum Gee (竹林寺), Wu Tai Shan (五台山) in Shanxi province and on Mt. Longhu (龙虎山) in Jiangxi (江西) province. The monk, Som Dot (三达祖师), created this new martial art system in the 18th century. He passed the art on to Lee Kun Ching (李官清), later known as Lee Siem See (李禅师; a name that can be translated as "Zen master Lee"). Lee Siem See would travel to Southern China and spread the art amongst the general population. In Guangdong, his student, Cheung Yiu Chung (张耀宗), would later return with him to Kwong Sai to complete his training at Jook Lum Gee.
In 1919, Cheung returned to reside in Wei Yang Xian (Wei Yang County) Dan Shui in Guangdong Province. During the winter of 1929, Cheung opened his first martial arts school and a traditional Chinese medicine clinic in Bao'an County in Píngshān (坪山) Town and continued to promote the Jook Lum system. Wong Yook-Kong (黄(公)毓光) and Lum Wing-Fay (林荣辉; 1910–1992; also known as Lum Sang (林生; Lum Sang can be translated as Mr. Lum ) and Lee Shen Sheng (李肾胜) are some of his students from that period.
Cheung eventually moved to Hong Kong. He opened a martial arts studio and became the head teacher to the Hong Kong Hakka ship and dock workers union. The classes in Hong Kong was taught by Wong Yook-Kong and this school still exists today. Wong Yook-Kong was described as a large man and in training he placed great emphasis on strength and physical conditioning before moving onto the more internal aspects of the style. One of his favorite training method was to practise with 30 to 60 LB iron rings on his wrist while he perform his forms. As a result, his students also emphasize those aspects in their training.
The lineage of Wong Yook Kong is continued by his two sons: Wong Yiu Hung (黄耀雄) and Wong Yiu Hwa (黄耀华) and other students such as Lee Kwok Leung, (李国良) and Sifu John Koo of Portland, Oregon (a Disciple of both Wong Yook-Kong and Lee Wing Sing).In the 1920s Lum Sang, one of the youngest of Cheung's students in Hong Kong, was fortunate enough to meet and study with Lee Siem See during one of Lee Siem See's trips to Hong Kong to establish a Buddhist temple (Chuk Lam Sim Yuen). Lum studied and traveled with Lee for the next seven years. In the 1930s, Lum returned to Hong Kong and opened a Kwong Sai Jook Lum Temple Tong Long Pai school in Kowloon. Lum Wing Fay was described as being small in stature, being only 5'2" and 120 lbs. In practise, he placed emphasis on softness and redirection and his students continue to display those traits. In 1942, Lum Sang emigrated to the United States and settled in the Chinatown of New York City. He started teaching in Chinatown's Hakka Association, the New York Hip Sing Tong at Pell Street. In the late 1950s, he taught at Free Mason Association Athletic Club, also known as Hung Ching. By 1963, his Kwong-Sai Jook Lum Gee Tong Long Pai was one of the largest kung fu schools. In 1969, Lam Sang retired from teaching and migrated to Taiwan. Lam Sang died in 1991. His students such as Harry Sun, Wong Buk Lam, Gin Foon-Mark, Henry Poo Yee and Louie Jack Man would establish themselves as teachers following the example and high esteemed reputation earned by Gin Foon Mark, after Lum Sang retired. All of these men have promoted this art in the United States and around the world. Gin Foon Mark became the most well known practitioner and master of the art passed to him by Lam Sang.