Todd Spangler NY Digital EditorAT&T elected Luis Ubiñas, a former senior partner at international consulting firm McKinsey & Co., to its board of directors.With Ubiñas’s appointment, the number of directors on AT&T’s board increases to 13. He will serve on the board’s public policy and corporate reputation committee.Ubiñas, 58, most recently served as president of the Ford Foundation and as an appointee to both the U.S.