John D. Lesak, AIA, LEED AP, FAPT, is a Principal with Page & Turnbull and manager of the Los Angeles area office. With an interdisciplinary education in architecture, engineering, and materials science, John has specialized in the preservation, rehabilitation, repair, and reuse of historic structures since 1993. 

During the course of his career, he has been privileged to serve as a historic architect on a number of award-winning preservation projects–including the exterior rehabilitations of the Wisconsin State Capital and Los Angeles City Hall, the relocation of the Cape Hatteras Lighthouse, and the restoration of the spire at the Frank Lloyd Wright designed Marin County Civic Center. Concerns over the socio-cultural impact of environmental degradation led John to co-found and serve as past US-chair of Association of Preservation Technology International (APTi’s) Sustainable Preservation Technical Committee. He has co-authored published papers and lectured on seismic impacts, deterioration mechanisms and restoration of historic cladding systems. John has written and/or lectured on the relationship between green building and historic preservation for the APTi, Traditional Building magazine, the National Trust for Historic Preservation, the California Preservation Foundation, and the Municipal Green Building Conference and Expo. 

John meets the Secretary of the Interior’s Professional Qualification 
Standards for Architecture and Historic Architecture.