Schmitz first became involved in politics in 1968, when she joined the
Democrats 66 (D66). From 1972 to 1974, Schmitz was a member of the Rotterdam City Council. She served first as a member of the D66 and then, in 1974, joined the
Labour Party (PvdA). Schmitz was elected as the mayor of
Haarlem between 16 February 1985 and 3 August 1994. She succeeded
Jos van Kemenade as vice president of
Pax Christi in 1986. She remained in this position until she joined the cabinet in 1994. Schmitz was a deputy judge in the district court in Zwolle between 1999 and 2008 and a deputy judge in the district court in Zutphen between 2004 and 2008. She was a member of the Advisory Council on International Affairs between 2001 and January 2006 and a chair of the Advisory Board Members Selection Committee Judiciary from 2005. == Personal life and death ==