Eddie Redmayne has won the Oscar for Best Actor for his role in 'The Theory of Everything'.
Speaking backstage after the ceremony in Los Angeles, Redmayne said: "For Stephen Hawking, the illness was of little interest to him. He lives forward, passionately."
On making the movie, he said: "When I watch a film, I believe what I see on screen. We felt a responsibility to tell their story."
The 33-year-old joked that the best actor win will give him some peace of mind about his future career.
"I've always had to fight for jobs. Retaining employment will keep me very happy," he said.
Alejandro G. Inarritu has won the best directing Oscar for 'Birdman'.
Birdman has won the Oscar for best original screenplay.
The film was written by director Alejandro G. Inarritu along with Alexander Dinelaris Nicolás Giacobone, and Armando Bo.
The Oscars has sparked some controversy after comic Joan Rivers was missed out by its In Memoriam section.
Actor John Barrowman tweeted his surprise at her exclusion.
Actress and singer Jennifer Lopez has posted a behind-the-scenes Oscars 2015 selfie with Hollywood legend Meryl Streep on Instagram.
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Patricia Arquette has won the best supporting actress Oscar for her role in Boyhood.
Last year's best supporting actor Jared Leto presented the award.
Accepting her statuette, Arquette paid tribute to the other "beautiful powerful nominees" and "my Boyhood family who I love and admire".
In a highly political speech, she said: "To every woman who gave birth, to every taxpayer and citizen of this nation, we have fought for everybody else's equal rights. It's our time to have wage equality once and for all and equal rights for women in the United States of America."
Poland's 'Ida', which is about a young woman on the verge of taking vows as a Catholic nun, has won the Academy Award for best foreign language film.
Nicole Kidman and Chiwetel Ejiofor presented the award to the film's director Pawel Pawlikowski, who lives and works in England. He told the audience: "Life is full of surprises".
J.K. Simmons has won the Best Supporting Actor award for his role in the film Whiplash.
Hollywood stars are arriving for the Oscars 2015 ceremony at the Dolby Theatre in Los Angeles.
British actor Eddie Redmayne, who is nominated for the Best Actor award, has arrived at the Oscars ceremony in Los Angeles.
Redymayne is expected to face tough competition from Michael Keaton who has been nominated for his performance in Birdman.