1936
Mr. Koehn is born in Winterset, Iowa to Cyril Otto and Ilene L. Koehn.
1952
Mr. Koehn joins the United States Naval Reserve as a Seaman.
1957
Mr. Koehn marries Francia C. Leeper.
1958
Mr. Koehn receives a Bachelor of Arts from the University of Iowa and is commissioned in the United States Naval Reserve on active duty.
1961
Mr. Koehn joins the board of editors of the Iowa Law Review.
1963
Mr. Koehn graduates cum laude from the University of Iowa with a Doctor of Jurisprudence.
1963
Mr. Koehn is admitted to practice in the state of Iowa and joins Davis, Brown, Professional Corporation in Des Moines, Iowa.
1967
Mr. Koehn retires as a Lieutenant in the United States Naval Reserve.
1969
Mr. Koehn co-founds Big Brothers-Sisters of Greater Des Moines.
1970
Mr. Koehn is appointed chairman of the Des Moines Friendship Commission.
1971
Mr. Koehn is admitted to practice in the United States Supreme Court and the United States Court of Appeals for the Eighth Circuit.
1972
Mr. Koehn is admitted to practice in the United States Court of Appeals for the Tenth and Second Circuits.
1977
Mr. Koehn is admitted to practice in the United States Court of Appeals for the Fifth Circuit.
2000
Mr. Koehn serves Of Counsel at Davis, Brown, Professional Corporation.
2004
Mr. Koehn serves as an arbitrator for the Commercial Construction Section of AAA.
2012
Mr. Koehn is appointed president of Rotary Club International.
2016
Mr. Koehn retires from practicing law.