John Tejada (born 21 April 1974 in Vienna, Austria), is an electronic music artist, music producer, DJ, and record label owner. His Austrian father was an orchestra composer/conductor who met his mother, a soprano singer of Mexican-American descent, while she was studying in Vienna.

He has recorded under diverse monikers for various labels. Names he has recorded under include Mr. Hazeltine, Lucid Dream, and Autodidact. He also provided a remix to "Such Great Heights", from The Postal Service.