[1] His father Jean Krug – a commission merchant of Prussian ancestry – had been born in Brazil, in 1842; his mother Ida, in Hamburg, Germany, in 1846.
Upon his return to the United States, Krug maintained an architectural practice with offices on Broadway and in Orange, NJ, designing buildings in the greater New York City area.
He was also one of the select group of architects who designed buildings for the planned suburban community of ‘’Livingston Manor’’ in Highland Park, NJ.
Krug designed numerous grand houses and mansions in the Late-revival styles, whereby each residence conveyed academic qualities, while having unique characteristics.
Brick facades, Ionic fluted columns, Gothic Revival and Palladian style windows and doors are uniquely characterized on the homes of Krug's designs.