Academic genealogy of Siegfried Hess

The subsequent list of names provides the location of the university and the year from which and when the corresponding man received, possibly "in absentia", his (first) doctoral degree; followed by the title of the underlying thesis. The (principal) thesis supervisor of each man was the next one on the list.

Siegfried HESS (born 1940)
Erlangen, Germany, 1967
Verallgemeinerte Boltzmanngleichung für mehratomige Gase

Ludwig WALDMANN (1913 - 1980)
München, Germany, 1937
Über eine Verallgemeinerung der Boltzmannschen Abzaehlungsmethode auf das van der Waalsche Gas

Arnold J. W. SOMMERFELD (1868 - 1951)
Königsberg/Ostpreussen, Germany (now: Kaliningrad, Russia), 1891
Die willkürlichen Functionen in der mathematischen Physik

C. L. Ferdinand (von) LINDEMANN (1852 - 1939)
Erlangen, Germany, 1873
Über unendlich kleine Bewegungen und über Kraftsysteme bei allgemeiner projektivischer Massbestimmung

Ch. Felix KLEIN (1849 - 1925)
Bonn, Preussen (now: Germany), 1868
Über die Transformation der allgemeinen Gleichung des zweiten Grades zwischen Linien-Koordinaten auf eine kanonische Form

Julius PLÜCKER (1801 - 1868)
Marburg, Hessen (now: Germany), 1823 ("in absentia")
Generalem analyseos applicationem ad ea quae geometriae altiores et mechanicae basis et fundamenta sunt e serie Tayloria deducit

The geometer and physicist PLÜCKER clearly was KLEIN's teacher, but he died a few months before KLEIN's final examination on 12. Dec. 1868. Since the analyst Rudolph O. S. LIPSCHITZ (1832 - 1903) was in charge of that examination, some sources consider him as KLEIN's (second) supervisor.

Christian L. GERLING (1788 - 1864)
Göttingen, Hannover (now: Germany), 1812
Methodi proiectiones orthographicae usum ad calculos parallacticos facilitandos explicavit simulque eclipsin solarem die 7. Sept. 1820 apparituram (?)

J. Carl Friedrich GAUSS (1777 - 1855)
Helmstedt, Braunschweig (now: Germany), 1799 ("in absentia")
Demonstratio nova theorematis, omnem functionem algebraicam rationalem integram unius variabilis in factores reales primi vel secundi gradus resolvi posse

Johann F. PFAFF (1765 - 1825)
Göttingen, Hannover (now: Germany), 1786
Commentatio de ortibus et occasibus siderum apud auctores classicos commemoratis

Abraham G. KÄSTNER (1719 - 1800)
Leipzig, Sachsen (now: Germany), 1739
Theoria radicum in aequationibus

Christian A. HAUSEN (1693 - 1743)
Wittenberg, Sachsen (now: Germany), 1713 (?)
Ex philologicis de asiarchis

Christian A. SIBER (1662 (?) - ?)
Wittenberg, Sachsen (now: Germany), 1682 (?)
De stylo novi testamenti graeco (?)

Some sources:
The MacTutor History of Mathematics archive (University of St Andrews, Scotland) The Mathematical Genealogy Project (North Dakota State University, USA)