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1 June 1973|
Zagger was born in Leytonstone, London. His father is of Russian-Polish ancestry and his mother is of Spanish-Portuguese ancestry. Zagger was raised a practising Jew by his parents but now considers himself to be more traditionalist. While attending Davenant Foundation School his interest in acting began affecting his attendance, so the headmaster suggested that he move to an acting school. He left his school and enrolled at Italia Conti Academy of Performing Arts.
Zagger's first professional acting role was portraying a young Marti Pellow in the Wet Wet Wet music video I Remember. Other roles soon followed; from 1990–1991, Zagger played Mike Bentley in the children's TV drama Grange Hill, and later in 1991 he played the role of "Razors" in the Granada Television series Up the Garden Path. He also had several guest roles in Minder, Casualty, Wycliffe, Dangerous Lady and The Bill.
In 1999, Zagger auditioned for the role of Dale Smith in The Bill, but the role went to his best friend Alex Walkinshaw and the character of PC Nick Klein was created for him. Zagger remained in the role for five years. Zagger left the series and took the role of Antipholus of Syracuse in the Stafford festival's production of Shakespeare's The Comedy of Errors.
In 2006 Rene starred in the Dream Team mini-series Dream Team 80's as striker Johnny Fletcher, who was the father to Harchester legend Karl Fletcher.
In 2006, Zagger filmed the historical drama, O Jerusalem, and vampire-horror film Night Junkies with Giles Alderson and Katia Winter. O Jerusalem was shown in France on October 18, 2006, and Night Junkies was released in December.
In 2007 Zagger played the Israeli nuclear technician Mordechai Vanunu, who leaked the existence of the Israeli secret Nuclear Weapons plant at Dimona in 1986 and was subsequently kidnapped by Mossad in the BBC Nuclear Secrets episode "Vanunu and the Bomb".
In January 2008, he made an appearance as Colt Winchester (Colin from Winchester) in the 5th episode of series three of MIHigh called "Dark Star".
In January 2010, he made an appearance as Farris Andreou in the second episode in the second series of Law and Order UK called "Hidden".
From November 2011 to April 2012, he starred in Comedy of Errors alongside Lenny Henry at the National Theatre in Southbank, London.
In March 2013, he performed in the stage play Hope, written and directed by Scot Williams and co-starred with Samantha Womack and Mark Womack. The play ran at the Royal Court Theatre, Liverpool. In 2014, he joined the cast of the new musical Made in Dagenham, originating the role of Stan.