Ebert was born in Los Angeles in 1978, the son of a psychotherapist, Michael Ebert, and actress Lisa Richards. His father would often take the family on long car trips through the desert. On one such trip, his mother took a video of his father chanting in the desert, cradling Alex's baby sister Gabi, which would one day become a part of the video for the Edward Sharpe and the Magnetic Zeros song "Desert Song". His grandfather Carl Ebert had been Intendant of Deutsche Oper, Berlin; he also was a famous actor trained by Max Reinhardt.