Karl Otto Weber
Karl Otto Weber( December 29, 1827 – June 11, 1867) was a German surgeon and pathologist born in Frankfurt am Main.
Joachim Leilich
Joachim Leilich( born 1949) is an emeritus professor of philosophy at the University of Antwerp, of German origin, who formerly held positions as a tutor and student- assistant at the university of Frankfurt.
His main research topics are analytical philosophy, phenomenal consciousness, Ludwig Wittgenstein, and freedom of the will.
He obtained his PhD under supervision of Karl- Otto Apel in Frankfurt.
Adela Cortina
Adela Cortina is a Spanish philosopher born in Valencia, Spain.
After getting her degree of philosophy and letters in the University of Valencia, she entered the metaphysics department in 1969.
In 1976, she defended her doctorate's thesis, about God in the Kantian transcendental philosophy, and taught for some time in middle- grade institutes.
A research grant allowed her to visit the University of Munich, where she came in contact with critical rationalism, pragmatism, Marxist ethics and more specifically, with the philosophy of Jürgen Habermas and Karl- Otto Apel.
Upon reentering academia in Spain, she oriented her research efforts into ethics.
In 1981, she entered the philosophy department of her alma mater, the University of Valencia.
She is a frequent contributor to El Pais.
Karl Otto Ludwig von Arnim
Karl Otto Ludwig von Arnim( 1 August 1779 in Berlin – 9 February 1861 in Berlin) was a German travel writer.
Adolf Arndt
Karl Otto Adolf Arndt( 12 March 1904 – 13 February 1974) was a German politician and a member of the SPD.
He was born in Königsberg and died in Kassel.
Helmut Beumann
Helmut Karl Otto Beumann( 23 October 1912, Braunschweig- 14 August 1995, Marburg) was a German historian.
Karl-Otto Apel
Karl- Otto Apel( 15 March 1922 – 15 May 2017) was a German philosopher and Professor Emeritus at the University of Frankfurt am Main.
He specialized on the philosophy of language and is thus considered a communication theorist.
He developed a distinctive philosophical approach which he called transcendental pragmatics(" Transzendentalpragmatik").
Carl Heissler
Carl or Karl Heissler( 18 January 1823 – 13 November 1878) was an Austrian violinist and violist.
Karl Otto Hunziker
Karl Otto Hunziker( 13 August 1841 – 23 May 1909) was a Swiss professor of pedagogy, a pastor, and a politician.
Wolfgang Siemens
Wolfgang Siemens( born 4 February 1945 in Thüringen, died 29 February 2016) was a German painter.

Question: Who was born earlier, Wolfgang Siemens or Karl-Otto Apel?
Answer: Karl-Otto Apel