Peyman was born to a couple, who were from Persian descent, in
New York. He was born as Peymaan Moaadi, but later used the name Peyman Moaadi to avoid confusion. His mother was a homemaker, and his father was a lawyer by profession. When he was about four or five years old, his family moved back to Iran due to the financial crisis. He graduated from the Islamic Azad University of Karaj, where he did his major in Metallurgical Engineering. He is a very famous screenwriter and actor of many Iranian and American films.
He began his Hollywood career as a writer in the movie called The Swan Song, which was released in the year 2000. In the year 2002, he became the costumes designer for the motion picture, 'Thirst', which became a sleeper hit. Wedding Dinner and Cafe Setareh were two movies where Peyman played the role of a director advisor, in 2006. In 2007, he wrote and directed the short film, The Lipstick. His first debut film as a lead actor was in 'About Elly', which was directed by the most renowned director,
Asghar Farhadi, in 2008. Moaadi's performance was recognized by the audience and appreciated by the critics. His acting in that film got him a lot of attention.
However, his second movie, 'The Separation', became very popular as it had gained a nomination at the Oscars for the Best Foreign Film, and won many Academy Awards too. Peyman won the Best Actor Award in the Best Actor International Cinephile Society Awards, Asia Pacific Screen Awards, and in the Village Voice Film Poll too. At the Berlin International Film Festival, for Best Actor in a Leading Role category, he received the Silver Bear Award. In 2013, Peyman's directorial debut film was named as 'The Snow on the Pines', and it was awarded the Audience Award for Best Film at the Fajr International Film Festival.
His next film was Camp X-Ray, where his role was that of a Muslim, who has been detained for eight years in Guantanamo, and befriends a new US army soldier there, who is played by Kristen Stewart. It was directed and written by Peter Sattler. It was Peter's debut movie. The movie received mixed reviews, and it was chosen to be screened at the 2014 Sundance Film Festival. At the Shanghai International Film Festival, he was also selected as a jury member. He is now being featured in a television series called Criminal Justice, on HBO.
His upcoming movies include The Last Knights, Window Horses, and 13 Hours: The Secret Soldiers of Benghazi.
He got married to Rana Hamidi, in the year 2008, and they have two children together.