PHOENIX—GlobeSt.com recently caught up with Flynann Janisse,  the executive director of Rainbow Housing Assistance Corporation, a nonprofit organization that provides service-enriched housing programs for residents of rental housing communities throughout the country.  Rainbow seeks to create and preserve quality, affordable housing for families and individuals of diverse ethnic, social and economic backgrounds. GlobeSt.com asked Janisse to define impact investing and give a sense of its growing popularity.