Sun Lu-t'ang was a renowned master of Chinese Neijia (internal) martial arts and was the progenitor of the syncretic art of Sun style Tai Chi Chuan (孫家). He was also considered an accomplished Neo-Confucian and Taoist scholar (especially in the I Ching), and was a distinguished contributor to the theory of internal martial arts through his many published works. Wikipedia
The definitive Wikipedia entry for Sun Lu-T'Ang. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Sun_Lu-t%27ang