It depends on the cuture of an organisation, within the USA the CEO is above any numbers of Presidents. Above the CEO is the Chairman and sometimes the Chairman and the CEO is the same person. In other organisations/cultures the President is the senior position for example in the government of the US or in some University colleges.

Chief Executive Officer : Highest ranking executive in a company President : Second tier, directly below CEO. this is a compactor between them on this link : https://www.diffen.com/difference/Chief_Executive_Officer_vs_President

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