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Extract from Wikipedia. ...........

Early life and education

Efron was born in San Luis Obispo, California, and later moved to Arroyo Grande, California. His father, David Efron, is an electrical engineer at a power station, and his mother, Starla Baskett, is a secretary who worked at the same power plant. Efron has a brother, Dylan, and had, as he has described it, a "normal childhood" in a middle-class family. He was raised in an agnostichousehold and did not practice any religion as a child. His surname, "Efron" (אפרון), is an Ashkenazi Jewish surname, taken from a Biblical place name (his paternal grandfather was Jewish, and Zac has described himself as Jewish).

Efron has said that he would "flip out" if he got a "B" and not an "A" in school, as well as that he was a class clown. His father encouraged him to begin acting when Zac was eleven years old. Efron subsequently appeared in theater productions at his high school, worked in the theater The Great American Melodrama and Vaudeville, and began taking singing lessons. He performed in shows such as Gypsy; Peter Pan; or, The Boy Who Wouldn't Grow Up;Little Shop of Horrors; and The Music Man. He was recommended to an agent in Los Angeles by his drama teacher, Robyn Metchik (the mother of actors Aaron Michael Metchik and Asher Metchik). Efron was later signed to theCreative Artists Agency.

Efron graduated from Arroyo Grande High School in 2006  and was then accepted into the University of Southern California, but has deferred his enrollment to work on film projects. He also attended Pacific Conservatory of the Performing Arts, a community college located in Santa Maria, California, which provided him with the opportunity to perform as a "young player" during the years of 2000 and 2001

2006–09: High School Musical and breakthrough

Efron’s career reached a turning point with the teen musical television film High School Musical (2006), which premiered on the Disney Channel in January 2006. The film, which has been described as a modern adaptation of Romeo and Juliet, saw Efron playing the male lead Troy Bolton, a high school basketball player who feels conflicted when he finds himself interested in participating in the school musical with Gabriella Montez (Vanessa Hudgens), a girl from the scholastic decathlon team. The film, which also starred Ashley Tisdale, Lucas Grabeel, Corbin Bleu, and Monique Coleman in pivotal roles, became a major success and helped Efron gain recognition among teenage audiences. The film’s soundtrack was certified quadruple platinum by the RIAA, making it one of the best-selling albums of the year in the United States. Efron’s singing talents were disputed when it was revealed that his voice had been blended with Drew Seeley’s on the soundtrack, but Efron clarified that the songs (written for a tenor) were written before he was cast and therefore did not suit his more baritone vocal range. In his subsequent musical films, Efron did his own singing.

Efron was next seen playing the role of Link Larkin in the musical comedy filmHairspray (2007), based on the 2002 Broadway musical of the same name. The film became a major commercial and critical success upon its release in July 2007. Later that year, he was seen reprising his role of Troy Bolton in High School Musical 2 (2007), which aired on the Disney Channel in August 2007.

Efron went on to reprise his role of Troy Bolton in High School Musical 3: Senior Year (2008), the first film in the High School Musical franchise to receive a theatrical release. The film became a major blockbuster at the box office, and received mixed to positive reviews from critics. He followed this with the commercially successful comedy 17 Again (2009) about a 37-year-old man (Matthew Perry) who is transformed into his 17-year-old self (Efron) after a chance accident