Today Lake Effect debuts a new monthly series: How Did You Do That? Pulitzer Prize-winning journalist and executive director of the Milwaukee Institute Kathleen Gallagher and Tim Keane, director of Golden Angels Investors and an entrepreneur who led his own startup to a profitable acquisition, talk with successful entrepreneurs about how – and why – they succeeded. When Retail Target Marketing Systems Inc. failed to mail catalogs to some of Boston Store's key customers a week before a big sale,