Head of the school appears to be a grand-student of Wan Lai-Seng 萬籟聲. Wan's own teacher Du Xin-Wu 杜心五 was famous for being the "modern" promoter of their art Ziranmen 自然門 early last century. Wan's forte was Shaolin Liuhe 六合. He did have some knowledge of the 3 sister arts (Xinyi, Bagua, Taiji) like many Northern boxers who were active in the Shanghai/Nanking social circle at the time.

A clip from of Wan (in his 90s) from his DVD:

http://hk.youtube.com/watch?v=bI_6jx6lRnI