Victor Schlegel (1843–1905) was a German mathematician.
 He is remembered for promoting the geometric algebra of Hermann Grassmann and for a method of visualizing polytopes called Schlegel diagrams.
Prof. Dr. Reinhard Alfred Furrer (25 November 1940 – 9 September 1995) was a German physicist and astronaut.
Tunnel 57 was a tunnel under the Berlin Wall that on the third and fourth October 1964 was the location of a mass escape by 57 East Berlin citizens.
 Student and future astronaut Reinhard Furrer was among the West German escape helpers who assisted the East Berliners in escaping.
 During the escape, East German border guards came upon the scene.
 A West German escape helper, Christian Zobel, opened fire, the bullet piercing the shoulder of young East German guard Egon Schultz, who was then fatally wounded by friendly fire from another guard.
 This friendly fire was kept secret by the GDR government.
 A memorial plaque on the site today commemorates both the successful escape, and Schultz's death as a victim of the Berlin Wall.
Hans Wilhelm Schlegel (Überlingen, 3 August 1951) is a German physicist, an ESA astronaut, and a veteran of two NASA Space Shuttle missions.
Karl Paul Schlegel (7 May 1893 – 27 October 1918) was a German World War I flying ace credited with 22 victories.
 Schlegel was shot down by French ace Petar Marinovich.
 He was the last German ace to be killed in World War I.
Dorothea Tieck (March 1799 – 21 February 1841) was a German translator, known particularly for her translations of William Shakespeare.
 She was born in Berlin, Brandenburg, as the daughter of Ludwig Tieck, and collaborated with her father and his Romantic literary circle, including August Wilhelm Schlegel and Wolf Heinrich Graf von Baudissin.
 She completed the translation of Shakespeare's works her father had begun with Schlegel and Baudissin, and worked also on Miguel de Cervantes and other Spanish writers.
Rhacophorus schlegelii (common names: Japanese gliding frog, Schlegel's green tree frog, Schlegel's flying frog, Schlegel's tree frog) is a species of frog in the family Rhacophoridae.
 It is endemic to Japan and found in Honshu, Shikoku, Kyushu as well as the Ryukyu Islands.
 It is named after Hermann Schlegel, a 19th century German zoologist.
August Wilhelm (after 1812: von) Schlegel (8 September 1767 – 12 May 1845), usually cited as August Schlegel, was a German poet, translator and critic, and with his brother Friedrich Schlegel the leading influence within Jena Romanticism.
 His translations of Shakespeare turned the English dramatist's works into German classics.
 Schlegel was also the first professor of Sanskrit in Continental Europe and produced a translation of the "Bhagavad Gita".
Karl Wilhelm Friedrich (after 1814: von) Schlegel (10 March 1772 – 12 January 1829), usually cited as Friedrich Schlegel, was a German poet, literary critic, philosopher, philologist and Indologist.
 With his older brother, August Wilhelm Schlegel, he was one of the main figures of the Jena romantics.
 He was a zealous promoter of the Romantic movement and inspired Samuel Taylor Coleridge, Adam Mickiewicz and Kazimierz Brodziński.
 Schlegel was a pioneer in Indo-European studies, comparative linguistics, morphological typology, and was the first to notice what became known as Grimm's law.
Carmela Schlegel (born March 9, 1983) is a Swiss former swimmer, who specialized in breaststroke events.
 She is a single-time Olympian (2004), a double Swiss champion, and a former national record holder in the 100 m breaststroke.
 Schlegel also played for Uster Wallisellen Swim Club (German: "Schwimmclub Uster Wallisellen" ) in Uster, under her coach Ralph Müller.

Question: Hans Schlegel and Reinhard Furrer, are German, of which mutual occupations?
Answer: physicist and astronaut