A registered architect in the states of Georgia and Florida and urban designer, Gladwin has a Master of Architecture in Urban Design from Harvard University and a Bachelor of Architecture from the University of Miami. Céline has worked worldwide in partnership with various private and public organizations including the Harvard University School of Design and the United Nations Educational, Scientific, and Cultural Organization.

Gladwin currently serves on the City of Valdosta Historic Preservation Commission and is a former member of the Georgia National Register Review Board and the Greater Lowndes Planning Commission. She maintains memberships in the American Institute of Architects, the Congress of New Urbanism, the National Trust for Historic Preservation, and the Georgia and Florida Historic Trusts.