Parker spent nearly five years leading Georgia's largest transit agency and is widely credited with turning around the agency's finances, improving its operations and cultivating a better relationship with state lawmakers.
Parker’s departure comes at a crucial time for mass transit in Georgia.
MARTA is planning expansions in Atlanta and Clayton County, while Fulton and Gwinnett counties may hold transit referendums next year. State lawmakers are discussing regular funding for transit capital projects as well as a new transit governance structure for the Atlanta region.
Parker has said his successor must "take the baton from current leadership and advance us to the next level."
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