Maryland Transit Administration Administrator Holly Arnold, who has led the administration for the last five years, announced that she will resign in September. While I will miss the amazing MTA team, I am excited for what the future holds and look forward to spending more time with my family. “During her time at the helm of the MTA, Administrator Arnold faced challenges head-on and worked tirelessly to improve service for all riders,” Moore said in a statement. “Our residents, employers and families have seen the impact of her efforts first-hand, and we are grateful to Administrator Arnold for her diligent service to our state. Arnold’s final day on the job as MTA administrator will be Sept. 1.