Martin Munzel Martin Munzel is an internationally recognized speaker, author, and SAP consultant specializing in SAP Controlling functionality. He has more than 20 years of experience working with SAP, both as an external and in-house consultant. Martin has extensive experience implementing SAP FI/CO solutions in Europe, Asia, and North America in the manufacturing and wholesale industries as well as in the public sector. He regularly speaks at international SAP conferences and delivers training for consultants and SAP users. Martin is the Co-founder and Managing Director of Espresso Tutorials, a publishing company focused on short and concise SAP textbooks. He is the author of New SAP Controlling Planning Interface, First Steps in SAP, as well as a number of best-selling German titles.