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Following this, Mayo joined Bell Labs, now Nokia Bell Labs, (1955) where he first worked on early computers as the TRADIC and Leprechaun, the Telstar satellite, ocean sonar systems and various switching systems. He was elected vice president at Bell Labs (1975) and eventually became the seventh president (1991) until his retirement (1995). He is credited with globalizing Bell Labs and forging closer ties between its research and development and business units.