Martin Esch is one of the two Managing Directors of Projektkultur GmbH (www.projektkultur.biz), a consulting firm that‘s part of the AdManus Consulting Network (www.admanus.de) and specializes in SAP ERP HCM and project management. He has been specializing in IT-based HR management in the SAP environment since 1993 and has managed numerous projects as a consultant. One of his main focuses in consulting is the authorization system in SAP ERP HCM.

Anja Marxsen (Junold) has been working as an SAP ERP HCM Consultant at iProCon GmbH (www.iprocon.de) since 2002. During this time, she has gathered experience in both national and international HR departments. Anja is a co-author of the books HR Reporting with SAP and SAP-Personalwirtschaft für Anwender, both published by SAP PRESS. iProCon GmbH offers services related to SAP ERP HCM. The HR service tree reference model is an iProCon product available for ordering.