Marilyn D. Walker is author of the $53,000 Sales Letter, and an expert on marketing and promoting small businesses with a specialty in toy stores. She also assists and coaches business owners in setting up business systems that work for them, not systems that some book or software tells you should work. Her clients are as diverse as software for design of remote power systems to dance instruction. Ms. Walker has a Ph.D. in Environmental Biology from the University of Colorado. She has started, developed, and run 2 ecommerce businesses, run a world-class toy store with a global reach, been a professor of biology and statistics, and has authored dozens of articles and book chapters on arctic and alpine ecosystems and climate change.