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.