In 1988, Glenn started what would become Integrated Conservation Resources (ICR), and Integrated Conservation Contracting (ICC), to combine investigative architectural conservation services with high-quality conservation craft and contracting. His expertise includes specialized conditions investigation, materials testing, analysis, and the design and implementation of architectural conservation treatment programs. Prior to graduate school, Glenn was the Director of Restoration for the Nantucket Historical Association. After studying at Columbia University’s Graduate Program in Historic Preservation, Glenn served as Staff Conservator for the Center for Preservation Research at Columbia University. He was an Adjunct Assistant Professor at Columbia University’s Graduate Program in Historic Preservation and speaks and teaches widely on architectural conservation and historic preservation issues. Glenn along with the team at ICR-ICC have completed projects throughout the United States, Europe, and Asia. Glenn currently serves as a Trustee on the James Marston Fitch Charitable Foundation.