Baron Karl von Hasenauer (20 July 1833 – 4 January 1894) was an important Austria

Austria

Austria , officially the Republic of Austria , is a landlocked country of roughly 8.4 million people in Central Europe. It is bordered by the Czech Republic and Germany to the north, Slovakia and Hungary to the east, Slovenia and Italy to the south, and Switzerland and Liechtenstein to the...

n architect

Architect

An architect is a person trained in the planning, design and oversight of the construction of buildings. To practice architecture means to offer or render services in connection with the design and construction of a building, or group of buildings and the space within the site surrounding the...

 and key representative of the Historismus

Historicism (art)

Historicism refers to artistic styles that draw their inspiration from copying historic styles or artisans. After neo-classicism, which could itself be considered a historicist movement, the 19th century saw a new historicist phase marked by a return to a more ancient classicism, in particular in...

 school.

He created several Neo-Baroque monuments, many around near the Ringstraße

Ringstraße

The Ringstraße is a circular road surrounding the Innere Stadt district of Vienna, Austria and is one of its main sights...

 in Vienna

Vienna

Vienna is the capital and largest city of the Republic of Austria and one of the nine states of Austria. Vienna is Austria's primary city, with a population of about 1.723 million , and is by far the largest city in Austria, as well as its cultural, economic, and political centre...

. He was also a student of August Sicard von Sicardsburg and Eduard van der Nüll

Eduard van der Nüll

Eduard van der Nüll was an Austrian architect, who was one of the great masters in the historicist style of Vienna's Ringstrasse.-Life and work:...

. For his outstanding work, he was ennobled by Emperor Franz Joseph I in 1873, and given the Freiherr

Freiherr

The German titles Freiherr and Freifrau and Freiin are titles of nobility, used preceding a person's given name or, after 1919, before the surname...

 nobility title.

Hasenauer was the chief architect for the Vienna World's Fair in 1873. Together with Gottfried Semper

Gottfried Semper

Gottfried Semper was a German architect, art critic, and professor of architecture, who designed and built the Semper Opera House in Dresden between 1838 and 1841. In 1849 he took part in the May Uprising in Dresden and was put on the government's wanted list. Semper fled first to Zürich and later...

 he designed the complex with the Kunsthistorisches Museum

Kunsthistorisches Museum

The Kunsthistorisches Museum is an art museum in Vienna, Austria. Housed in its festive palatial building on Ringstraße, it is crowned with an octagonal dome...

 (the Museum of Art History) and the Naturhistorisches Museum

Naturhistorisches Museum

The Naturhistorisches Museum Wien or NHMW is a large museum located in Vienna, Austria.The collections displayed cover , and the museum has a website providing an overview as a video virtual tour....

 (Natural History Museum) (1871–1891), the Burgtheater

Burgtheater

The Burgtheater , originally known as K.K. Theater an der Burg, then until 1918 as the K.K. Hofburgtheater, is the Austrian National Theatre in Vienna and one of the most important German language theatres in the world.The Burgtheater was created in 1741 and has become known as "die Burg" by the...

 (1874–1888), the Hermesvilla

Hermesvilla

The Hermesvilla is a palace in the Lainzer Tiergarten, in Vienna, a former hunting area for the Habsburg nobility. Emperor Franz Joseph I gave it to his wife Empress Elisabeth , and he called it the "castle of dreams.“ The name of the villa refers to a statue of Hermes made of white marble that is...

 and the Neue Hofburg (1881–1894, completed in 1913).

After a conflict with his former business partner Semper he managed the building of the Hofburg alone. The conflict over attribution of their joint projects continues to this day between the supporters of Semper and Hasenauer. However, because the older master Semper is credited with the Semperoper

Semperoper

The Semperoper is the opera house of the Sächsische Staatsoper Dresden and the concert hall of the Sächsische Staatskapelle Dresden . It is located near the Elbe River in the historic center of Dresden, Germany.The opera house was originally built by the architect Gottfried Semper in 1841...

 in Dresden

Dresden

Dresden is the capital city of the Free State of Saxony in Germany. It is situated in a valley on the River Elbe, near the Czech border. The Dresden conurbation is part of the Saxon Triangle metropolitan area....

, Hasenauer receives more credit for the architecture in the Ringstraße.