Soviet-born British psychologist Konstantin Vasily Petrides ("K. V. Petrides") proposed a conceptual distinction between the ability based model and a trait based model of EI and has been developing the latter over many years in numerous scientific publications.
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(2001) “The economic value of emotional intelligence competencies and EIC-based HR programs”, in The Emotionally Intelligent Workplace: How to Select for, Measure, and Improve Emotional Intelligence in Individuals, Groups and Organizations.
In his book "Working with Emotional Intelligence", US business author Daniel Goleman introduced his theory of emotional intelligence.