Dirk Herzog is a member of the BW consulting team at SAP AG and has led numerous national and international implementations of BW and Strategic Enterprise Management (SEM). After graduating with a degree in business mathematics from Technische Universität Berlin, Germany, he started his career in 1996 in the CO-OM development department at SAP in Walldorf, Germany. Dirk also has developed solutions and solution concepts for complex modeling and implementation. He is co-author of the PDEBWB course on "User Exits in SAP BW," and has taught the course several times. Whenever he has the time, Dirk writes Web logs in the SAP Community Network (SCN) and answers forum questions.