Margie Mader-Clark has worked at the highest levels of the HR profession for more than 15 years, primarily in the fast-paced world of Silicon Valley. She has experienced the power of good management -- and the devastating impact of poor management. Mader-Clark has worked with numerous companies to develop commonsense HR principles to guide their employment policies. Lisa Guerin is the author or co-author of several Nolo books, including The Manager's Legal Handbook, Dealing with Problem Employees, The Essential Guide to Federal Employment Laws, The Essential Guide to Workplace Investigations, and Create Your Own Employee Handbook. Guerin has practiced employment law in government, public interest, and private practice where she represented clients at all levels of state and federal courts and in agency proceedings. She is a graduate of Boalt Hall School of Law at the University of California at Berkeley.