Cisco Systems
TEL29 chambers lloyd

John Chambers
CEO of Cisco (CSCO, Fortune 500) since 1995

The 63-year-old chief recently said he may retire within the next four years.

Robert Lloyd
EVP, Worldwide Operations

Lloyd, 56, has hung in for two decades and is frequently named as a possible next in line.

  @FortuneMagazine - Last updated October 16 2012 06:24 AM ET
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