After his A levels, Lehne studied law, physics and philosophy at the universities of Freiburg, Cologne, Bonn and Düsseldorf from 1978 to 1986.
Following the conclusion of his studies, he took up a position as a lawyer in Düsseldorf.

His brother Olaf Lehne is a member of the Parliament of North Rhine-Westphalia since 2005.
After his A levels, Lehne studied law, physics and philosophy at the universities of Freiburg, Cologne, Bonn and Düsseldorf from 1978 to 1986. Following the conclusion of his studies, he took up a position as a lawyer in Düsseldorf. 
His brother Olaf Lehne is a member of the Parliament of North Rhine-Westphalia since 2005.
Klaus-Heiner Lehne