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ADT College was established in 1991 as a City Technology College, funded by donations from various organisations including ADT Security Services (whose owner at the time was Baron Michael Ashcroft), Unisys, British Gas and Young's (who sponsored the schools "music bunker").
In 2006, in preparation for Vonage's IPO, Michael Snyder, former president of ADT Security Services replaced Vonage co-founder Jeffrey A. Citron as CEO.