张坚

Public information about Zhang Jian is limited, and the available sources do not establish his nationality, dates of birth and death, or professional career. Judging from the five works held in the collection, his writing spans medicine and management, covering notably different subjects. In medicine, he focuses on traditional Chinese medicine diagnosis and everyday health: he is the author of Ten Lectures on Tongue Diagnosis and its second edition, which set out the key points of tongue diagnosis in lecture form, and of An Illustrated Guide to Chinese Medicine Culture (Chinese and English), which combines visual presentation with international outreach. He also took part in compiling the 2015–2017 Monitoring Report on the Nutrition and Health Status of Chinese Residents, which concerns nutrition and health surveillance. In management, The Sales Mindset for Key Accounts shows his attention to sales practice. Overall, his works emphasize practicality and accessibility, are written in plain language, and address both professional and general readers.