The three original concepts developed by taylor, fayol, and mayo, that remain at the heart of hospitality management, are:

Taylor: scientific organization of work

Fayol: Management and administration within a company

Mayo: Human relationships

Explanation:

Taylor  was an American engineer who developed the concept of scientific organization of work, in which the greatest benefit is to obtain both, the benefit of the employer and the employee. Thanks to this concept Taylor was known as the father of engineering efficiency, since his main objective was to avoid any loss of time or money in the industry.

Fayol was known as the father of the modern administration thanks to his great contributions within the managerial field. This engineer was the first to propose that the bases of a company's problems were not simply based on the operational part but could have its main roots from the managerial and administrative part within the organization.

Mayo was an Australian researcher who developed his work primarily in the United States at Harvard University. His interests were mainly focused  in human relations within organizations rather than in the operative part for obtaining good results in the production of a company.