When Mr Ozaki was a student, he witnessed the moment when his grandfather, bedridden from a brain hemorrhage, breathed his last on the futon in his tatami room. When he became a reporter for the Nihon Keizai Shimbun (Nikkei), he read the suicide note of an elderly bedridden woman who hanged herself in a tatami room ("I don't want my family to take care of me"). This was the starting point of his life's work on various issues in the aging society, including home medical care, nursing care for the elderly, and hospice care. Since becoming a staff writer and senior staff writer of the Nikkei's Lifestyle News Department, he has been immersed in this field. He covered the process of establishing the long-term care insurance system, support activities for the elderly and disabled after the Great Hanshin Earthquake, and the scene of hospice care at home.

After retiring from the company, he became a professor at Sendai Shirayuri Women's College and a director of the Legal-Support Adult Guardian Center, and has been involved in the management of public interest organizations related to home healthcare, nursing care, and welfare, including as a trustee of the Social Welfare Organization Saiseikai Imperial Gift Foundation, Inc. and the Sawayaka Welfare Foundation.

In the civic movement, he has served as vice chairman of Specified Nonprofit Corporation Community Care Link Tokyo, since its establishment. His motivation for joining those organizations is to observe them from the inside through the eyes of an independent citizen. He pays close attention to trends that are common among organizations in this field, such as paternalism.