WENDY ROSEN , founder and president of The Rosen Group in Baltimore, Md., started her business in the classic entrepreneurial way: she saw a need others had overlooked, and she moved quickly and decisively to fill it. Twenty-five years ago, a potter at a local craft show informed her that craft artists desperately needed business assistance. Her interest piqued, Rosen set out to learn more about artists’ business needs. Within weeks, Rosen had uncovered a market for providing business services to artists.