A pupil of both Pestalozzi and Jacobi, I was given a new "chair of geometry" at the University of Berlin...where I stayed until I died.
My consistent focus was synthetic geometry, avoiding analytic geometry because it was "a disgrace."
Due to the generality of my ideas and the rigor of my proofs, some historians claim I was the "greatest pure geometer genius since Apollonius of Perga."
I established and expanded a synthetic basis for projective geometry, conics and other curves, and even maxima and minima properties representative of the calculus of variations.
Mathematician Thomas Hirst described me as follows: "He is a middle-aged man, of pretty stout proportions, has a long intellectual face, with beard and moustache and a fine prominent forehead, hair dark rather inclining to turn grey. The first thing that strikes you on his face is a dash of care and anxiety, almost pain, as if arising from physical suffering - he has rheumatism. He never prepares his lectures beforehand. He thus often stumbles or fails to prove what he wishes at the moment, and at every such failure he is sure to make some characteristic remark."
Jakob Steiner (1796-1863)