Graduate, university, 1959; Doctor of Philosophy, 1965; Doctor of Science, 1975.
Assistant professor, Jena, 1962-1970;
assistant professor, vice director, Control Institute Linguistics, Academy Sciences, Berlin, 1970-1976;
professor, vice director department linguistics, Jena, 1976-1979;
full professor, vice director linguistics, head Institute German Language, Jena, 1979-1993;
full professor, head chair German Linguistics, Jena, since 1993. Visiting professor Tbilisi, Georgia, Soviet Union, 1968, Krakow, Poland, 1969-1970, Saarbrücken, Germany, 1988, 89, 90, 91. Member Council Philos.Faculty, Jena, 1991-1995.
Member board directors, member task team Melton Foundation, Le Mars, Iowa, 1992-1997.
Member German Linguistic Society (president 1994-1997).
Son of Georg Koell and Martha Elisabeth Suchsland. M. Ingeburg Charlotte Böttger, April 19, 1958. 1 child, Thomas.