Arnold J. Berk is an American professor of microbiology and immunology at the University of California, Los Angeles. He was a member of the Molecular Biology Institute, a division of University of California, Los Angeles.[ He was one of the discoverers of RNA splicing.] His work focuses on gene regulation in DNA viruses.[ In 1998 he was elected to the American Academy of Arts and Sciences.] In 2003, he received a MERIT Award from the National Cancer Institute. He authored editions 3 through 10 of the influential basic textbook Molecular Cell Biology published by Macmillan.