P. Justin Detwiler is the Creative Director at John Milner Architects, joining the firm in 2005. His design philosophy is defined by a deep understanding of historic precedent and an unwavering attention to detail. Specializing in both architectural design and historic preservation, Justin excels at blending classical environments with contemporary functionality across a diverse range of residential and institutional projects. A resident of Northwest Philadelphia, Justin is a leading advocate for the city’s historic built environment. Since 2018, he has served on the Architectural Committee of the Philadelphia Historical Commission, lending his expertise to preserve the city's architectural integrity. His commitment to the field is further reflected in his 18-year tenure as an Adjunct Professor at Philadelphia University’s College of Architecture and the Built Environment (now Thomas Jefferson University), where he also earned his Bachelor of Architecture. Justin’s leadership extends to several of the region’s most storied institutions. He serves on the Board of Directors for the Athenaeum of Philadelphia—focusing on the interpretation of their architectural collections—and on the Property Committee of The Woodmere Art Museum. His past service includes board and committee leadership for the Philadelphia Society for the Preservation of Landmarks, Hidden City Philadelphia, and the Elfreth's Alley Association. He is also a member of the Preservation Alliance for Greater Philadelphia, where he was a founding member of its "Young Friends" group. Justin’s international studies began at the American University of Rome and he was selected for the prestigious “Royal Collection Studies” and the Attingham Trust’s Summer School in England. He has been honored with the Edward Maverick Prize and fellowships as a Royal Oak Foundation Scholar and a Stuart G. Rosenblum Scholar. Justin’s work and insights have been featured in premier publications including Architectural Digest, The Wall Street Journal, Period Homes, and Traditional Building. He is also an avid collector of 18th and 19th-century American and English antiques, decorative arts, and rare architectural books.