Edwin Justus Mayer (November 8, 1896 – September 11, 1960) was an American screenwriter. He wrote or co-wrote the screenplays for 47 films between 1927 and 1958.He was born and died in New York, New York. He is the grandfather of film director Daisy von Scherler Mayer.Edwin Justus Mayer worked on many screenplays. But he is famous today for working with Ernst Lubitsch. He worked with Lubitsch on To Be or Not to Be (1942) and A Royal Scandal (1945).