In 2007, Lerman appeared in the thriller The Number 23, in which he played the son of Walter Sparrow (Jim Carrey), a man who becomes obsessed with numerology.
stated that, though the film was uneven, Lerman "displays a supreme confidence". Also that year, Lerman had a leading role in the Renée Zellweger comedy feature My One and Only, playing a teenage character based on actor George Hamilton – depicted as an aspiring writer who, after his parents split, accompanies his mother and brother on a cross-country trip, eventually arriving in Hollywood.
During his teenage years, Lerman and his family had viewed his acting work as just a "hobby" before college; his parents had only become more comfortable with acting as a career in 2010, the year of Percy Jackson's release.
He was dating Duncan's sister and Veronica's best friend, Lilly Kane, on and off for two years until she was murdered during their sophomore year, and he later finds out that the killer was his A-list actor father, Aaron Echolls.
Veronica's choices at the time leave Logan feeling betrayed and he takes to bullying her.
In August 2010, Lerman appeared in "Change the Odds", a public service announcement video for the Stand Up to Cancer charity; the video also featured Dakota Fanning, Zac Efron, Andrew Garfield and other actors.
Lerman starred in a film adaptation of Stephen Chbosky's novel The Perks of Being a Wallflower, playing the lead role, Charlie; filming took place in 2011, and the movie was released in September 2012.
But as time passed, Veronica discovered that Logan was much more than that.
The abused son of superstar movie actor Aaron Echolls, Logan was the on-again, off-again boyfriend of the deceased Lilly Kane and close friends with Veronica Mars and her then-boyfriend Duncan Kane.
He made his film debut in 2000's The Patriot, playing William Martin, one of the children of Mel Gibson's character.
The same year, he appeared in another Mel Gibson film, What Women Want, playing Gibson's character as a child.
He will also star opposite John Hawkes and Sarah Bolger in the film End of Sentence, in which he will play the son of Hawkes' character, as the two travel to Ireland. who played his best friend on Jack & Bobby; they remained close after the series' cancellation, and worked together again on Hoot, where Collins had a supporting role.