Maggie Wilderotter (born Mary Agnes Sullivan; February 9, 1955) is the former chief executive officer of Frontier Communications, from November 2004 to April 2015; then executive chairman of the company until April 2016. During her tenure with Frontier, the company grew from a regional telephone company with customer revenues of less than $3 billion to a national broadband, voice and video provider with operations in 29 states and annualized revenues in excess of $10 billion.