At that time Richard Walker, then a visiting professor at NTU and a close personal friend of Tsui's, had a deep impression of Liu--he often saw Liu babysitting for the Tsuis.
當時也在台大教書、和崔書琴私交甚篤的美籍同事兼鄰居哈佛客座教授吳克博士，就對劉紹唐印象深刻﹘﹘他常在崔書琴家幫師母帶小孩。