LOS ANGELES—Oscar-winning sound mixer Tom Fleischman has resigned from the Academy of Motion Picture Arts and Sciences in protest over the organization’s plans to present Academy Awards in several categories—including sound—prior to the show’s national telecast. A spokesman for Fleischman, a longtime collaborator with filmmaker Martin Scorsese, confirmed to several media outlets, including The Hollywood Reporter and Variety, that he had surrendered his membership to the organization. Fleischman, who won a sound-mixing Oscar for his work on “Hugo,” a 2011 Scorsese film, reportedly resigned shortly after the Academy announced plans to reduced the number of live, on-air award presentations. His other nominations were for his work on the Scorsese films “The Aviator” and “Gangs of New York,” along with “The Silence of the Lambs” and “Reds.” Fleischman also worked on Scorsese’s films “Goodfellas,” “The Departed” and “Raging Bull” and several Spike Lee films including “Do the Right Thing,” “Mo’ Better …