He starred in the science fiction adventure film Explorers (1985) and had his first notable role in 1986's Stand by Me, a coming-of-age film based on the novella The Body by Stephen King. He began his acting career at age 10 in television commercials. He had no formal schooling, but showed an instinctive talent for the guitar. Phoenix grew up in an itinerant family, as the older brother of Rain Phoenix, Joaquin Phoenix, Liberty Phoenix, and Summer Phoenix. River Jude Phoenix ( né Bottom Aug– October 31, 1993) was an American actor and musician.