president and CEO; president and chief executive officer
A formal compound title combining 社長 (company president) and 最高経営責任者 (chief executive officer). Used in corporate contexts to indicate one person holds both roles.
He leads the company as president and CEO.
Compound of 社長 (company president) + 兼 (and, concurrently) + 最高経営責任者 (chief executive officer).