Safe and Secure Public Transport 9 mei 2008 E-DOCA & DOCA Seminar - Amsterdam, Nederland.
	Safe and Secure Schools 19 mei 2006 E-DOCA & DOCA Seminar - Amsterdam, Nederland.
	10th Conference of the Int. CPTED Association (ICA) 1-3 Augustus 2005 Santiago, Chili.
	9th Conference of the Int. CPTED Association (ICA) 14-16 Sept. 2004 Brisbane, Australia.
	3th Conference of the Int. CPTED Association (ICA) 14-16 December 1998 Washington, USA.