During the comeback portion of his career, Phoenix went back to his given name Joaquin and was often cast in supporting roles as conflicted, insecure characters with a dark side. In 1995, he co-starred in To Die For, as the disturbed young man Jimmy who gets seduced by Suzanne Stone (Nicole Kidman) to commit murder. Directed by Gus Van Sant, the film was screened out of competition at the 1995 Cannes Film Festival and became a financial and critical success, resulting in a domestic box office total of $21 million. New York Times critic Janet Maslin praised Phoenix's performance, writing "So pity poor Jimmy. Rivetingly played by Mr. Phoenix with a raw, anguished expressiveness that makes him an actor to watch for, Jimmy is both tempted and terrified by Suzanne's slick amorality. In that, he speaks for us all." In 1997, Phoenix played a small-town troublemaker in Oliver Stone's U Turn, and a poor man in love with a rich woman in Inventing the Abbotts. The films were received with mostly mixed and negative reviews, respectively, and neither performed well at the box office. The following year, Phoenix starred in Clay Pigeons (1998) as a young man in a small town who befriends a serial killer. Budgeted at $8 million, the film became a box office flop, grossing only $1 million and was, like Phoenix's previous projects, not well received by critics. In his next film, 8mm (1999), Phoenix co-starred as an adult video store employee who helps Tom Welles (Nicolas Cage) penetrate the underworld of illegal pornography. The film turned out be a box office success, grossing $96 million worldwide, but found few admirers among critics. In 2006, Phoenix was invited to join the Academy of Motion Picture Arts and Sciences. In 2007, Phoenix reunited with director James Gray for the film We Own the Night, which he also produced. In the film, Phoenix played a New York nightclub manager who tries to save his brother and father from Russian mafia hit men. The film premiered at the 2007 Cannes Film Festival, receiving mixed reviews from critics and grossed a total of $54.5 million worldwide. Critic Peter Travers described Phoenix as "electrifying and then some", and he was awarded the People's Choice Award for Favorite Leading Man for the performance. For his second film of 2007, Phoenix also reunited with director Terry George for the film Reservation Road. In it, Phoenix played a father obsessed with finding out who killed his son in a hit-and-run accident. The film failed at the box office and received negative reviews from critics, with film critic Peter Travers writing "Even the best actors -- and I'd rank Joaquin Phoenix and Mark Ruffalo among their generation's finest -- can't save a movie that aims for tragedy but stalls at soap opera." Phoenix made his third collaboration with director James Gray in the film Two Lovers (2008), where he played a bachelor torn between the family friend his parents wish he would marry and his beautiful but volatile new neighbor. Two Lovers premiered in competition at the 2008 Cannes Film Festival in May, receiving largely positive reviews, especially Phoenix who was praised by film critics David Edelstein who wrote "He [Phoenix] is, once again, stupendous, and stupendous in a way he has never been before" and Roger Ebert describing his performance as "perfect pitch". Two Lovers grossed $16 million worldwide. Phoenix's mockumentary film I'm Still Here (2010) premiered at the 67th Venice International Film Festival on September 6, 2010. The film was directed by Phoenix's then brother-in-law Casey Affleck and was also written by Affleck and Phoenix himself. The film purports to follow the life of Phoenix, from the announcement of his retirement from acting, through his transition into a career as a hip hop artist. Filming officially began on January 16, 2009 at a Las Vegas nightclub. Throughout the filming period, Phoenix remained in character for public appearances, giving many the impression that he was genuinely pursuing a new career. Although widely suspected to be a "mockumentary," the fact that the events of the film had been deliberately staged was not disclosed until after the film had been released. The film received mixed reviews and failed at the box office. After the releasing of the film, Phoenix took a self-imposed break from acting. Since 2006, he has been living on top of the Hollywood Hills. In early April 2005, Phoenix checked into rehab to be treated for alcoholism. On January 26, 2006, while driving down a winding canyon road in Hollywood, Phoenix ran off the road and rolled his car. The crash was reportedly caused by brake failure. Shaken and confused, Phoenix heard a tapping on his window and a voice say, "Just relax." Unable to see the man, Phoenix replied, "I'm fine. I am relaxed." The man replied, "No, you're not," and stopped Phoenix from lighting a cigarette while gasoline was leaking into the car cabin. Phoenix then realized that the man was famed German film director Werner Herzog. While Herzog helped Phoenix out of the wreckage by breaking the back window of the car, bystanders phoned for an ambulance. Phoenix approached Herzog to express gratitude, but Herzog downplayed his heroism and returned to his home nearby. Phoenix unexpectedly announced in late 2008 that he had retired from acting to pursue a rapping career, and that the forthcoming Two Lovers would be his last film. On February 11, 2009, Phoenix appeared on the Late Show with David Letterman to promote Two Lovers. He seemed incoherent and was largely unresponsive towards David Letterman's questions about the film and his career plans. Phoenix appeared on Late Show again on September 22, 2010, and revealed that his "retirement" and eccentric behavior were for a mockumentary, I'm Still Here (2010), that he and Casey Affleck were filming. In October 2012, Phoenix proclaimed the Academy Awards to be "bullshit". He later gave an interview amending his earlier comments and acknowledging that the Oscars provide an important platform for many deserving filmmakers. He added more to the topic while on Jimmy Kimmel Live in 2015, saying that he is uncomfortable receiving accolades for his work in films when he considers the filmmaking process to be a collaborative one.

Answer this question "What is important about his personal life?" by extracting the answer from the text above.
In early April 2005, Phoenix checked into rehab to be treated for alcoholism.