李定信先生，1922年生于江西赣州，1939年毕业于黄埔军校16期工科，系黄埔军校同学会会员。曾经跟随蒋经国先生工作过。由于李老天资聪颖，学有专长，潜心研习，是风水宗师杨益（字筠松，号救贫）之嫡传徒裔。1999年-2001年曾三次被邀赴泰国学术交流和风水堪察，在泰国政野和侨界获得很高声誉，被泰国工商总会请任为特别顾问，被泰国易学堪舆会请任为高级学术顾问，是泰国侨领们推崇的风水大师。2001年，应邀赴张家界参加全国哲学文化年会讲学，由于李老在风水学方面学贯古今，博才真知，被张家界哲学文化研究会誉为"六百年间第一人"，被社会广传为"杨公再世"的风水大师。
李定信先生，专门从事客家杨益文化的研究和实践达半个多世纪。撰写了《中国风水发展简史》、《晋·郭璞〈葬书〉考》、《唐·杨筠松〈青囊奥语〉考》、《唐·曾文辿〈天玉经序〉考》、《唐·杨筠松〈天玉经〉考》、《宋·赖文俊<催官篇>白话解》、《四库全书堪舆类经典考》、《中国罗盘49层详解》、《订正中国罗盘52层详解》、《赣州杨救贫风水学》、《赣州杨救贫风水术教材》、《造命课择日法及万年历(授时历)的推算》等十余部客家风水著作。其中早年著作《中国罗盘49层详解》畅销于国内外。纠正了宋代蔡元定、元代吴澄误删误释郭璞《葬书》所增益的"气乘风则散，界水则止"和"葬乾、葬坤、葬震、葬巽、葬坎、葬兑、葬艮、葬离"的谬论。恢复了郭璞《葬书》的本来面貌。对杨筠松《青囊奥语》中"颠·颠倒"曾文辿《天玉经序》中"八神四个一，八神四个二"难以解释的隐语，作了正确的释义。考证了《四库全书》收录的十一部堪舆类经典。证实了"乾山乾向水朝乾……卯山卯向迎源水……午山午向午来堂……坤山坤向水源坤……"为七十二龙四大局。
其所授门生，遍及于海内外，凡具有中心结业证者都成为很高风水理论和丰富实践经验的风水师。最优而真传衣钵者，可以推出包括华南理工大学建筑学院博士生导师程建军教授等海内外一批德才兼优之学生。
李定信先生常云："我虽年愈耋年、誓为开发杨益文化，复兴赣州风水声誉，弘杨救贫神术，再展客家地理雄风，承前启后，古为今用，为建设人类新环境作出贡献而奋斗终生！"
A Brief Introduction to Mr. Li DinXin and His Life Story
Mr. Li DinXin, born in Ganzhou in 1922, graduated from Huangpu Military Academy, the 16th Engineering Course. He is a member of Huangpu Military Academy Mate-Coming Committee. As a result of his brilliant wisdom and talent and owing to his consistent research and study, Mr. Li has become the prentice of Master Yang Jiu-ping's favorite follower. Between 1999 and 2001, Mr. Li was invited and went to Thailand for three times for the international academy communion and Fengshui reconnaissance, and therefore he shares a great fame in the field of the Thailand government and public, especially the Thailand overseas Chinese field. He is retained as the special consultant by the Thailand Industry and Business Union and classified as the super academic consultant by Thailand Research Institute of The Book of Changes, He is regarded as Fengshui Master by the Thailand overseas Chinese leaders. In 2001, he was invited to the National Philosophy and Culture Annual in Zhangjiajie and lectured at the seminar. Because of his abundant learning, Mr. Li was classified as "the first one for six hundred years" by the Zhangjiajie Philosophy and Culture Research Institute and known as "the present Great Master Yang".
Mr. Li has specialized in the study and research of Hakka Yangyi culture and practiced it for more than half a century. He wrote A Brief History of Chinese Fenghui Development, A Study of Guopu's Wielding Book, A Atudy of QingNangAoYu by Yanjunsong, A Study of the Preface to TianYuJing, A Study of TianYuJing, A Study Of Imperial Collection of Four's Sutra, The 49 Illustrations to Chinese Compass, The Correction of the 52 Illustration to Chinese Compass, A Study of Yanjiuping's Fengshui in Ganzhou, and Date Selection by Zaomingke and the Calculation of Perpetual Calendar as well. The 49 Illustrations to Chinese Compass written while young has been the best seller both at home and abroad. It rectifies the mistakes by Cai Yuan Ding from Song Dynasty and WuCheng from Yuan Dynasty owing to their illegal deletion and ill illustration to Wielding Book, thus regaining the pure feature of the book. He gives the correct and sound explanation for QingNangAoYu and The Preface to TianYuJing. He gives the textual research on the sutras from Imperial Collection of Four. He confirms the inter-relationship between acupuncture point, mountain, river and environment.
With its prentices and followers all over the world, the center has trained a lot of masters with high theory expertise and practical experience. Of all the excellent continuators, Prof. Chen Jianjun, doctor tutor from South China Institute of Technology, ranks the first.
Mr. Li DinXin often says, "In spite of my old age, I am still devoting my time and efforts to the development of Yangyi culture, the renaissance of the reputation of Ganzhou's fengshui art, carrying forward the spirits of Yangjiupin and Hakka geography, to inherit the past and usher in the future, to make the past server the present.
