1932 – Born on February 25th. West German Social Democratic politician.
1956 – Married to Ingrid Apel.
1972 – Appointed as the Parliamentary State Secretary to the Foreign Minister.
1974 – Became the West German Minister of Finance.
1978 – Was the West German Minister of Defense.
1993 – Apel was appointed an honorary professor of Economics at the University of Rostock.