David McKenna (born August 14, 1968 in San Diego, California, USA) is an American screenwriter and producer. He worked as executive producer of E-Ring.
He used the screen name Zachary Long for Bully.
He wrote or played a major/minor part in such films as S.W.A.T and E-Ring T.V Episodes. He is perhaps best known for writing American History X and other novels such as "The Trials and Tribulations of Earl".