Eric Kwok Wai-leung[A] (born 3 February 1974) is a Hong Kong Cantopop music producer, composer, singer, and actor.

He moved to the United States at the age of 13 and later graduated from the University of California, Los Angeles majoring in communication.

[1] His passion for music started when he received a piano keyboard as a gift from his mother and would spend ten hours a day playing with it.

[2] Kwok returned to Hong Kong and launched his first songwriting credit in 1997 with Leon Lai's "If You Are at My Home Tonight", under the pen name Moz.

Over the years, he has written and produced hits for various artistes, including Leon Lai, Eason Chan, Cass Phang, and Kay Tse, to name a few.