Sarah B. Holder is a Preservation Specialist with the Clean & Protect Group at PROSOCO in Lawrence, KS. Within her role, she provides technical support related to historic building materials, material degradation, and product performance. She holds a M.S. in Historic Preservation with a degree concentration in materials conservation from the University of Texas at Austin. Her thesis research was a materials investigation of early concrete technology used in Seguin, Texas during the mid-19th century. During her time at UT, she worked in collaboration with UT Landmarks and the UT Architectural Conservation Laboratory to conduct an evaluation of graffiti control treatments. Sarah held a materials conservation internship with the National Center for Preservation Technology and Training (NCPTT) and previously worked with the Kansas Historical Society as the Review and Compliance Coordinator for the Kansas State Historic Preservation Office (SHPO). Sarah is an active member of the Association for Preservation Technology (APT) and the American Institute for the Conservation of Historic and Artistic Works (AIC) and has presented original research at their annual and regional meetings.