Dörner scored an amazing 65 goals in 392 top-flight games[2] for Dynamo Dresden, a record for a defender in the DDR-Oberliga.

His career as a player ended in 1986, and he later took on the role of trainer for the East German Olympic squad in 1990.

After German re-unification, he coached the Olympic youth side of the united country.

From 6 January 1996 until 20 August 1997 he was the coach for Bundesliga club Werder Bremen.

From 2006 to 2010 he coached Radebeuler BC 08 in the city league known as the Bezirksliga Dresden.