Stephen A. Johnston, Ph.D.

TDL Vice President, Steve is a consulting engineer for roofing, waterproofing, exterior walls, masonry, failure investigation, materials assessment and property condition assessment. He provides technical oversight of roof repair and replacement and performs failure investigation for insurance claims.

Steve’s comprehensive and longstanding interest in building design and construction extends to his off-hours activities. He is an enthusiastic collector of roofing memorabilia and antique tools of the trade as well as an avid reader of books focused on building crafts and the practical physics related to building construction. An active volunteer with Boy Scout groups in Maryland, he also shares his passion for building, its methods and tools with youth.

Steve earned a B.S, M.S. and Ph.D. in Materials Science and Engineering from The Johns Hopkins University.

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