He is the head coach of AEL Limassol of the Cyprus Basketball Division A.

Prior to his stint in Bayreuth, he was the head coach of Telekom Baskets Bonn from 2005 to 2013.

Koch played in Germany for MTV 1846 Giessen, Steiner Bayreuth, and TSV Bayer 04 Leverkusen.

Playing for Panathinaikos, Koch won 4 Greek League championships (1998, 1999, 2000, 2001), the EuroLeague (2000), and the 1996 FIBA Intercontinental Cup.

While playing for the senior men's German national basketball team, Koch won the gold medal at the EuroBasket 1993 at Germany.