MARTA's CEO Collie Greenwood resigned after his work permit expired, despite being legally present in the US. His situation underscores the complexities of immigration processing times and heightened scrutiny in the United States,

MARTA CEO Collie Greenwood has stepped down due to immigration and personal matters, the board announced Thursday.

Collie Greenwood has announced his early retirement from Metropolitan Atlanta Rapid Transit Authority (MARTA), where he spent the past six years, most recently as General Manager/CEO. MARTA Chief Customer Experience Officer Rhonda Allen is now serving in that role in an acting capacity.