Adolph Gustav Kiefer was born on June 27, 1918, in Chicago, Illinois and died on May 5, 2017.

He was an American former competition swimmer.

He was oldest living American Olympic champion, last Olympic champion of Berlin, former world record-holder, and inventor and innovator of new products related to aquatics competition.

Kiefer was the first man in the world to swim 100-yard backstroke in under one minute.

Kiefer died at home in Wadsworth, Illinois.

Adolph Kiefer passed away at 98 years old.