Detlef Lienau (1818-1887)
Detlef Lienau, Architect, of New York
Born in Germany (a part which was then in Denmark), he was educated at the L’Ecole des Beaux-Arts in Paris before coming to New York in 1848. He is credited with having introduced the French Second Empire style to American building construction, notably the mansard roof. He was one of the 29 founding members of the American Institute of Architects.