CEO is the most senior corporate, executive, or administrative officer in charge of managing an organization – especially an independent legal entity such as a company or nonprofit institution. CEOs lead a range of organizations, including public and private corporations, non-profit organizations and even some government organizations. The CEO of a corporation or company typically reports to the board of directors and is charged with maximizing the value of the entity, which may include maximizing the share price, market share, revenues, or another element.
Masoud Shokrani - CEO of Jooya Informatics Group
A chairman of the board is a seat of office in an organization, especially of corporations. Increasingly commonly "chair" or "chairperson".The chairman (also chair) is the highest officer of an organized group such as a board, a committee, or a deliberative assembly. The person holding the office is typically elected or appointed by the members of the group, and the chairman presides over meetings of the assembled group and conducts its business in an orderly fashion.
Jahangir Abbasi - Chairman of the Board (Jooya)