 As the Chief of the Fourth Directorate of the Soviet Ministry of Health, which took care of Soviet leaders, he is widely regarded to be a person responsible for the health of the Soviet leadership, although he sometimes denied that he was their "personal physician".In his book of memoirs, "Health and Power" he describes many circumstances concerning the health of the Soviet leaders and of some leaders of the Soviet satellites.Chazov is the director of the Moscow Cardiological Center since 1976.