Rebecca Guenther has 35 years of experience in national libraries, primarily working on library technology standards related to digital libraries. She has a bachelors’ degree from Beloit College in Wisconsin and a Masters of Science from Simmons College of Library Science. She started her career at the National Library of Medicine as a cataloger and later moved to the Library of Congress. Most of her professional life has been at the Library of Congress developing national and international standards related to metadata, including MARC, MODS, PREMIS, METS, and ISO language codes. She has served on numerous standards and implementation committees, several as chair, is widely published in professional literature, and has given many tutorials, workshops and presentations. She is currently living in New York, working remotely for the Library of Congress on MODS, PREMIS, LC's Linked Data Service, and the Bibliographic Framework Transition Initiative. In addition she is an adjunct professor in NYU's Moving Image Archiving and Preservation Program and does consulting on metadata issues.