Question: Café Griensteidl was a traditional Viennese café located at Michaelerplatz 2, at the Hofburg Palace in the Innere Stadt first district of Vienna, Austria, during the early twentieth century, the café was frequented by many artists, musicians, and writers, including who, which was an Austrian author and dramatist?

Context paragraphs:
Café Bräunerhof: Café Bräunerhof is a traditional Viennese café and restaurant located at Stallburggasse 2 in the Innere Stadt first district in Vienna, Austria.  Bräunerhof is best known for being the preferred café of the famous Austrian writer Thomas Bernhard.  Today there is a vitrine showing a picture of the author and pointing the direction to the café on a street corner nearby.  Every Saturday there is live music at the café with a small orchestra playing waltzes and classical music.

Arthur Schnitzler: Arthur Schnitzler (15 May 1862 – 21 October 1931) was an Austrian author and dramatist.

Café Landtmann: Café Landtmann is a traditional Viennese café located on the Ringstraße at the corner of Lowelstraße 22 in the Innere Stadt first district in Vienna, Austria.

Café Museum: Café Museum is a traditional Viennese café located in the Innere Stadt first district in Vienna, Austria.  The café opened in 1899.  The original interior was designed by renowned architect Adolf Loos.  The café became a meeting place for Viennese artists.

Café Griensteidl: Café Griensteidl was a traditional Viennese café located at Michaelerplatz 2 across from St. Michael's Gate at the Hofburg Palace in the Innere Stadt first district of Vienna, Austria.  The cafe was founded in 1847 by former pharmacist Heinrich Griensteidl.  In January 1897, the original building was demolished during the course of the renovation of Michaelerplatz.  In 1990, the café was reopened and became a popular location among the Viennese coffeehouse culture.  During the early twentieth century, the café was frequented by many artists, musicians, and writers, including Hugo von Hofmannsthal, Arthur Schnitzler, Arnold Schoenberg, Alexander Zemlinsky, Hermann Bahr, Friedrich Eckstein, Rudolf Steiner, Hugo Wolf, and Stefan Zweig.

Café Sperl: Café Sperl is a traditional Viennese café located at Gumpendorfer Straße 11 in the Mariahilf sixth district of Vienna, Austria.  The café is on the Austrian Register of Historic Places.

Café Central: Café Central is a traditional Viennese café located at Herrengasse 14 in the Innere Stadt first district of Vienna, Austria.  The café occupies the ground floor of the former Bank and Stockmarket Building, today called the Palais Ferstel after its architect Heinrich von Ferstel.

Café Schwarzenberg: Café Schwarzenberg is a traditional Viennese coffee house, located on the Ringstraße boulevard (Kärntner Ring No. 17) near Schwarzenbergplatz in the central Innere Stadt district of Vienna, Austria.  Unlike many other traditional Viennese coffeehouses, the Cafe Schwarzenberg did not cater to a clientele of artists and intellectuals.  The interior is notable for having remained largely unchanged since it was opened in the 19th century.

Kaffee Alt Wien: Kaffee Alt Wien is a traditional Viennese café located at Bäckerstraße 9 in the Innere Stadt first district in Vienna, Austria.  It was established in 1936 by Leopold Hawelka and his wife Josefine on the day after their wedding.  They ran the café until 1939 at which time they moved to Dorotheergasse, where they opened a new coffee house, the famous Café Hawelka.

Café Hawelka: Café Hawelka is a traditional Viennese café located at Dorotheergasse 6 in the Innere Stadt, the first district of Vienna, Austria.

Supporting paragraphs: Café Griensteidl Arthur Schnitzler
Answer: Arthur Schnitzler