Niehaus was born in Cincinnati, Ohio, to German parents.[1] He began working as a marble and wood carver, and then gained entrance to the McMicken School of Design in Cincinnati. He studied at the Royal Academy in Munich, Germany (1877–1881). The effect of the German study was that he retained much of the Neo-Classical flavor in his art while most other sculptors of his generation were drawn towards Beaux-Arts realism.
He returned to America in 1881. By virtue of being a native Ohioan, he was commissioned to sculpt two statues of the recently assassinated President James Garfield; one for Cincinnati (Garfield's home city), and the other, in another pose, for the National Statuary Hall Collection at the United States Capitol. He moved to Rome, Italy, where he worked on the commissions, and made a study of ancient sculpture. He modeled three major male nudes during his years in Rome, including The Scraper (1883) and Caestus (1883-1885). He returned to New York City in 1885, and opened a studio.[2]
Monuments by Niehaus can be found in many American cities. Several of the works authored by him are equestrian statues. As was the case with other sculptors of his day he also fashioned a fair amount of architectural sculpture.
In 1900 Niehaus married noted horticulturalist Regina Armstrong and moved to New Rochelle, New York.[4]
Bas-relief panel of Surrender of the Hessians, Trenton Battle Monument, Trenton, New Jersey, 1891–1893 William Rudolf O'Donovan sculpted the colossal George Washington statue atop the monument, and statues of two Continental soldiers flanking the entrance. Thomas Eakins modeled two other bas-relief panels.
Abraham Lincoln Monument, 1900. Replicas of Niehaus's Abraham Lincoln are at the Buffalo History Museum in Buffalo, New York,[10] and at Library Park in Kenosha, Wisconsin.
Bzdak, Meredith Arms, photographs by Douglas Peterson, Public Sculpture in New Jersey: Monuments to Collective identity, Rutgers University Press, New Brunswick, New Jersey, 1999
Connecticut State Capitol Statuary, The League of Women Voters of Connenticut: Education Fund
Hardin Campen, Richard N., Outdoor Sculpture in Ohio: A Comprehensive Overview of Outdoor Sculpture in Ohio, Mid-Nineteenth Century to the Present, West Summit Press, Chagrin Falls, Ohio, 1980
Kvaran, Einar Einarsson, Architectural Sculpture of America, unpublished manuscript
Opitz, Glenn B, Editor, Mantle Fielding's Dictionary of American Painters, Sculptors & Engravers, Apollo Book, Poughkeepsie NY, 1986