He qualifies as a historic preservation architect and an architectural historian under the Secretary of Interior's Qualification Standards. He is also a historic tax credit consultant who has done many buildings in the Baltimore - Washington area. He is a published architectural historian as the co-author of The Baltimore Rowhouse, Niernsee & Neilson - Architects of Baltimore, author of Monuments to Money - the Architecture of American Banks, Edmund Lind - Anglo-American Architect of Baltimore and the South. In addition, he does National Register nominations, historic structures reports, and 106 review.