Pictured here - left to right, William C.C. Chen, Frank Demaria, Sidney Austin.
This must be 1960's-early 70's. William, of course, introduced me to Taijiquan in 1964, I studied with him in late 1970's and hosted him at my school in Norfolk, VA. After meeting Dr. Jay at his then, Carroboro T'ai Chi Center (he had not yet at the time received his doctorate), our two schools attended each other's workshops including William's. Sidney was a student of Jou Tsung Hwa, and, when I met him in 1990's head teacher in his own school. He was also our senior student, Joe Tanzini's, first Taijiquan teacher in New Jersey.