General Motors Corp. names Megan Stooke, former Chevrolet director-advertising and sales promotions, as marketing director for its Hummer luxury brand, effective immediately.

Stooke, who joined the auto maker’s Australian unit, GM Holden Ltd., in 1995, will report to Martin Walsh, Hummer’s divisional general manager.

She succeeds Liz Vanzura, who was named in January to the post of global marketing director for GM’s Cadillac brand.