(Reuters) – Walt Disney Co has named Jack Dorsey, co-founder of Twitter Inc and chief government of funds startup Sq. Inc, as an unbiased board member. The corporate stated on Monday that Judith Estrin, a former Cisco Systems Inc chief expertise officer, will retire from the board at its March 18 annual assembly. The company stated its tenure coverage, which limits board provider to fifteen years. (Reporting with the aid of Ronald Grover; Modifying with the aid of Richard Chang)