Dr. Boris M Ariel graduated from high school in 1955 and continued to study in the 1st Leningrad Medical Institute. Being student he began my own scientific researches. In 1961 he obtained the medical diploma and continued the postgraduate studies at the Central Roentgen-Radiological Institute (Leningrad). In 1965 he defended his doctoral thesis "Myocard lesions after X-rays irradiation in the circumstances of heart and circulation functional loading". 1964-1974 he worked as a junior research scientist at the Institute for Experimental Medicine (Leningrad) on some aspects of infection pathology and in 1974-1981 – as an assistant professor at the institute for pathologic anatomy at the Pediatric Medical Academy (Leningrad). In his research he used traditional microscopic methods and electron microscopic methods too.The result of his scientific work of these years was MD thesis "Infectious process as a system problem". This trait runs like a thread through all his writings at the Institute of Phthisiopulmonology were he working now in a position of Chief of the Laboratory Diagnostic Department, and Scientific Consultant. For more than 40 years he serve as a freelance employee in 'Biology' (the reference journal of the Russian Academy of Sciences), translating articles from English, French, German, Italian, Spanish, and Portuguese and doing abstracts. He is a member of the Russian Department of the International Pathology Academy. His research interests are: Infection pathology, Tuberculosis, Lung pathology, Theoretical pathology, History of medicine.