TMM, Inc. announced that Mark Rosenthal has joined its Board of Directors. Rosenthal, a highly regarded media industry executive for more than 25 years, has helped to lead some of the world's best-known media and culture defining brands such as MTV, Music Television, Nickelodeon, VH1 and Comedy Central. Rosenthal currently serves as Chairman of the Executive Committee of Jazz at Lincoln Center, led by Wynton Marsalis.