The National Bank for Agriculture and Rural Development (Nabard) on Friday said Jiji Mammen has taken charge as chief general manager (CGM) at its Andhra Pradesh regional office from KR Nair, who will now move to the headoffice, Mumbai, to head the human resources management department. Mammen, was earlier heading the Rajasthan regional office of Nabard. Mammen began his career in Nabard in 1985 as a direct recruit officer, Nabard stated in a release.