Agaath Witteman studied art history, classical archaeology and theatre studies. She became known in Dutch theatre as cofounder of Theater Persona, where she worked as the director for four years. Between 1988 and 1993, she was the artistic director of Theater van het Oosten, directing such plays as Three Sisters and Electra. She was also a successful producer for De Appel, Het Noord Nederlands Toneel and the Nationale Toneel. Witteman taught at various theatre academies. She was also a member of the Arts Council and a PvdA senator. Since 2006, Witteman has been town councillor of Breukelen.