Winkmann in 2010
|Born||27 November 1973|
|Other occupation||Police officer|
Winkmann started his refereeing career in 2001, and in 2004 he was promoted to the 2. Bundeliga. In 2011, he was promoted to the elite group of referees who referee the Bundesliga. His first Bundesliga match was on 16 August 2008 when he refereed Energie Cottbus and TSG 1899 Hoffenheim
Guido lives in Kerken and is a police officer.