Two Cobb principals are resigning their posts at the end of the month. Paula Huffman will step down from Garrison Mill Elementary. Charlotte Stowers will leave Osborne High and become an interim area assistant superintendent from July 6 through Nov. 9. Jonathan K. Giesler will more from assistant principal at Rocky Mount Elementary to principal at Garrison Mill. Mary Finlayson will move from investigations manager, to director of employee relations in human resources. The changes were approved at Thursday's school board meeting