MARY S. SCHAEFFER is a nationally recognized accounts payable expert. She is the founder and Editorial Director of Accounts Payable Now & Tomorrow, a newsletter for professionals interested in payment issues. She is the author of twelve books and has written hundreds of articles that have appeared in publications such as the New York Times, Corporate Cashflow, Treasury and Risk Management, Business Credit, the Writer, and Newsday. She has an MBA in finance and is a member of the New York Financial Writers' Association.