Gwen Manthey is a professionally trained conservator of easel paintings, based in the mid-Atlantic. She received her training at the Winterthur/University of Delaware Program in Art Conservation, where she was awarded her M.S. and C.A.S. in the conservation of paintings. Her B.A.S. was obtained from the University of Delaware, where she majored in Art Conservation, with a minor in American Material Cultural Studies.

Manthey has worked with museums and private conservation studios across the United States, including the Museum of Fine Arts, Boston, the Museum of Fine Arts, Houston, Whitten & Proctor Fine Art Conservation (Houston, TX), the Corcoran Gallery of Art (D.C.), the Western Center for the Conservation of Fine Art (Denver, CO), the Walters Art Museum (Baltimore, MD), the Chrysler Museum of Art (Norfolk, VA), the Alaska State Museum (Juneau, AK), the Hermitage Museum and Gardens (Norfolk, VA), the Anchorage Museum (Anchorage, AK), and the American Philosophical Society Museum (Philadelphia, PA). She is currently Paintings Conservator at the Smithsonian American Art Museum (Washington, DC).

Manthey is a Professional Associate member of the American Institute for the Conservation of Fine Art and Artifacts (AIC). She serves on the Paintings Specialty Group Board of AIC, a Director for the Washington Conservation Guild, and is a past Chair of the Philadelphia Area Conservation Association and board member for the Philadelphia Alliance for Response.