Jeffrey Sonnenfeld (born 1 April 1954) is the Lester Crown Professor in the Practice of Management at Yale School of Management, and Senior Associate Dean for Leadership Studies. Sonnenfeld is best known as the founder and CEO of Chief Executive Leadership Institute (CELI), affiliated with Yale University.Sonnenfeld has advised thousands of CEOs as well as multiple U.S. presidents and nominees from both parties, including Joseph Biden, Donald Trump, and Bill Clinton as a conduit between top business and political leaders. In addition to convening regular CEO conferences, in the immediate aftermath of the 2020 United States presidential election and the 2021 United States Capitol attack, Sonnenfeld convened top executives for several high-level, off-the-record discussions to plan the collective response from the business community. He is the first academician to have rung the opening bells of both the New York Stock Exchange and the Nasdaq Stock Exchange, having done so 10 times. Amidst the 2022 Russian invasion of Ukraine, Sonnenfeld was involved in efforts to encourage multinational businesses to exit Russia through the Yale CELI List of Companies.