Simple past tense and past participle of chair.(verb)
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Use "chaired" in a sentence
"McCain chaired Gramm's short-lived presidential campaign in 1996; Gramm is co-chair of McCain's current effort."
"The one-time event turned into an annual one: Chanin chaired last year's conference on American policy toward AIDS in developing countries, with a keynote by Doctors Without Borders founder Bernard Kouchner, and he is co-chairing this year's conference on human trafficking, which includes a semester-long academic course, an art exhibit and film festival, and travel grants for 75 students from around the country to join hundreds from the Chicago area."
"His campaign manager routinely lobbied for corporations who had business before the Senate Commerce Committee that McCain chaired."