Both Richard Williams and Melville Shavelson served as President of the WGAw?
Richard Williams (animator): Richard Edmund Williams (born March 19, 1933) is a Canadian–British animator, voice artist, and writer, best known for serving as animation director on Disney/Amblin's "Who Framed Roger Rabbit" and for his unfinished feature film "The Thief and the Cobbler". Melville Shavelson:  He was President of the Writers Guild of America, West (WGAw) from 1969 to 1971, 1979 to 1981, and 1985 to 1987.
i don't know