John C. Healy, MST, CPA, is a lecturer in the graduate tax programs at the University of Wisconsin-Milwaukee and the managing director of the Deloitte & Touche Center for Multistate Taxation at the University of Wisconsin - Milwaukee. His tax experience of more than 25 years includes tax management positions with Miller Brewing Company and GE Medical Systems. He is a frequent author and speaker on state and local taxation and is a past recipient of the Institute for Professionals in Taxation’s Literary Award. He is also coauthor of CCH's Sales and Use Tax Answer Book.

Michael S. Schadewald, Ph.D., CPA, is on the faculty of the University of Wisconsin-Milwaukee, where he teaches graduate and undergraduate courses in business taxation. A graduate of the University of Minnesota, Professor Schadewald has published numerous articles in academic and professional journals, and has served on many editorial boards. He also co-authors CCH's Practical Guide to U.S. Taxation of International Transactions, and writes a column for CCH's “Journal of State Taxation."