Alvin Ailey American Dance Theater returns to New York City Center for a five-week (December 2, 2009 through January 3, 2010) season show and 20-city domestic tour celebrating Judith Jamison as she moves into her 20th year as artistic director, also making it her last year when she steps down as sole director in 2011. In its 50-year history, AAADT has been under the direction of only two people–Alvin Ailey and Jamison.–NH