Liebig played in the 2009, 2010, 2011 and 2012 German championship final for Heidelberger RK, losing the first one and winning the following three. He was one of four try scorers for HRK in the high-scoring 2010 final and also scored a try in the 2012 game.
He plays rugby since 1993.[2] His brother, Christopher Liebig, is also a German international.[3]
He made his debut for Germany against Georgia on 6 February 2010.[1]
He was part of a group of German players which were sent to South Africa in 2009 to improve their rugby skills at the Sharks Academy as part of the Wild Rugby Academy program.[4]