Born in 1961 in Stuttgart-Germany, Leander Kaiser studied with different well-named professors of percussion. From 1986 to 1988, he taught percussion at the University of Cologne, since 1988 he teaches at the Musikschule Starnberg. In 1990, he began composing for percussion. Since then, more than 40 of his compositions have been published.

In 1997, he won the first prize of the 24th Composition Contest of the Percussive Arts Society-USA with his work Black Sphinx for Marimba Solo. In July 1999 he won the first prize of the "3° International Challenge for Creative Percussionists" at Percfest in Laigueglia, Italy. For this contest, he exclusively played his own works. He played at two PAS Euro Meetings, 1999 in Tübingen, Germany and 2001 in Sofia, Bulgaria. He and his ensemble INDEX4 played at two World Drum Festivals, 1999/2000 in Hamburg, Germany.

In 2004, he won the Special Prize for a pedagogical composition at the first Wolkersdorf Composition Contest with his composition Die Sitzgruppe, for Percussion Quartet. His work Kick Box 261 won the third prize of the 2006 International Composition Contest of PAS-Italy. In 2008, he won first prize of the Composition Contest of the Classical Marimba League with Minotaurus 4.3 for marimba solo. He won third prize of the 2011 PAS-Italy Composition Contest with his work SchattenSägenFuge for piccolo and field drum.

His mallet-series "Leander Kaiser" is manufactured and distributed by Ernst Hosner.