Master of Science, University Turku, 1965. License philosophy, University Turku, 1967. Doctor of Philosophy, University Turku, 1968.
Assistant mathematics University Turku, 1965-1969. Associate professor computer science University Helsinki, 1969-1970, acting professor applied mathematics, 1970-1971. Professor computer science University Jyvaskyla, Finland, 1970.
Professor mathematics University Oulu, Finland, since 1971. Visiting professor mathematics University Florida, Gainesville, 1973-1974. Lecturer mathematics University Turku, since 1970.
Head department mathematics University Oulu, 1988-1997, member council faculty of science, 1988-1994.
Member European Association Theoretical Computer Science (member council 1988-1994).
Son of Sirkka Marketta Yli-Hakula, February 3, 1963. Children: Pekka, Ville-Veikko.