Schwarz was born in Bad Oldesloe. His father was German CDU-politician Werner Schwarz. Schwarz studied German law and he worked as a lawyer. From 1971 to 1975 and from 1979 to 1987 he was member of parliament in Schleswig-Holstein. After death of German CDU-politician Uwe Barschel Schwarz was minister-president of German state Schleswig-Holstein. He was married and had three children. He died in Kiel.