Background
Kieffer was born in Bergisch Gladbach.
Kieffer was born in Bergisch Gladbach.
He played most of his golf at Hubbelrath Golf Club in Düsseldorf, the same club as Martin Kaymer. He represented the German National team from 2005-2010 and represented Europe in the Junior Ryder Cup in 2006. He played college golf briefly in the United States at the University of Florida.
He turned professional in 2010.
In April 2013, Kieffer lost in a sudden-death playoff at the Open de España. In the joint longest playoff in European Tour history, Kieffer was beaten by a Raphaël Jacquelin birdie on the ninth playoff hole.
In May 2015, during round 3 of the Irish Open, Kieffer broke the Royal County Down course record set in 1939 by shooting 6-under-par 65. Challenge Tour wins (1) Amateur Junior Ryder Cup (representing Europe): 2006 Jacques Léglise Trophy (representing continental Europe): 2007, 2008 Bonallack Trophy (representing Europe): 2010 (canceled) Eisenhower Trophy (representing Germany): 2010 Professional World Cup (representing Germany): 2013.