An agency official with statutory or operational authority for specified information and responsibility for establishing the controls for its generation, collection, processing, dissemination, and disposal.
Source(s):
NIST SP 800-30 Rev. 1 under Information Steward from CNSSI 4009
NIST SP 800-39 under Information Steward from CNSSI 4009
NIST SP 800-53 Rev. 4 under Information Steward from CNSSI 4009
NIST SP 800-37 Rev. 2
NIST SP 800-53 Rev. 5 from NIST SP 800-37 Rev. 2

  Individual or group that helps to ensure the careful and responsible management of federal information belonging to the Nation as a whole, regardless of the entity or source that may have originated, created, or compiled the information. Information stewards provide maximum access to federal information to elements of the federal government and its customers, balanced by the obligation to protect the information in accordance with the provisions of the Federal Information Security Management Act (FISMA) and any associated security-related federal policies, directives, regulations, standards, and guidance.
Source(s):
CNSSI 4009-2015 from NIST SP 800-37 Rev. 1

  Individual or group that helps to ensure the careful and responsible management of federal information belonging to the Nation as a whole, regardless of the entity or source that may have originated, created, or compiled the information. Information stewards provide maximum access to federal information to elements of the federal government and its customers, balanced by the obligation to protect the information in accordance with the provisions of FISMA and any associated security-related federal policies, directives, regulations, standards, and guidance.
Source(s):
NIST SP 800-37 Rev. 1 under Information Steward