The upper echelons theory is a management theory published by Donald C. Hambrick and P. Mason in 1984.
It states that organizational outcomes are partially predicted by managerial background characteristics of the top level management team.
Donald C. Hambrick, a strategic management professor and P. Mason first published an article about the upper echelon perspective in 1984. The article is cited over 10,000 times  and several additional articles in this field of research have been published over the last decades.
The theory is used in human resource management as a framework helping to hire new executives. In addition to that, the theory can be used to analyze other market competitors or listed companies and predict future strategic decisions of CEOs.
^ abHambrick, Donald C.; Mason, Phyllis A. (1984). "Upper Echelons: The Organization as a Reflection of Its Top Managers". The Academy of Management Review. 9 (2): 193–206. doi:10.2307/258434. ISSN0363-7425. JSTOR258434.
^Carpenter, Mason A.; Geletkanycz, Marta A.; Sanders, Wm. Gerard (23 June 2016). "Upper Echelons Research Revisited: Antecedents, Elements, and Consequences of Top Management Team Composition". Journal of Management. 30 (6): 749–778. doi:10.1016/j.jm.2004.06.001.