Maslen was born in Woolwich, London, England on 25 June 1971. As a young boy Maslen admired the Royal Marines and attended Bromley Marines Cadets on a Monday and a Thursday at T.S. Narvik in Bromley Common. He was brought up in Woolwich and signed up to join the Royal Marines with his school friends, Marcus Marnham and Simon Farnham at the age of 16. He later sustained an injury whilst doing the PRMC, resulting in him not gaining entry to the Recruit training course. He has been a vegetarian since the age of 18; he discussed this on appearances on both The Paul O'Grady Show and Friday Night with Jonathan Ross. In 2009, he was voted as PETA's Sexiest Vegetarian alongside singer Leona Lewis.
Career
At the age of 18 he went to Miami and was spotted by photographer Bruce Weber. As a result of this encounter he began a career as an international model. Five years later, he turned to acting. After training at the Guildhall School of Music and Drama he landed a role in the successful television in peak practice and heartbeat, series Lock, Stock... in 2000. He has also played the live action rendition of Claude Speed in DMA Design's promotional video and opening sequence for Grand Theft Auto 2. After a few more television and film roles he landed his part in The Bill in 2002. On 13 July 2007 it was announced that Maslen would be leaving The Bill and joining the cast of EastEnders as regular character Jack Branning. His love interest was Ronnie Mitchell, played by best friend Samantha Womack. Both actors commented that they were uncomfortable doing love scenes since they have known each other most of their lives and are like brother and sister. Maslen left EastEnders on 15 October 2013. Maslen performed in the pantomime Aladdin at the Pavilion Theatre, Bournemouth over the Christmas/New Year period of 2013/14. He performed the same pantomime at the Marlowe Theatre, Canterbury over the Christmas/New Year period of 2014/15. He will perform it again at the Churchill Theatre, Bromley over Christmas/New Year 2015/16. In 2015, he competed in Celebrity Masterchef, but lost in the final, and took up a role of an MP named James Holloway in the American drama series The Royals. In April 2015, Maslen admitted that he had rejected the chance to return to EastEnders saying "I didn't want to go back just 18 months after leaving. There is an element of snobbery with soaps. It means people in the industry don't see you as an actor, they see you as a commodity." However, he made an unannounced return to the show on 24 December 2015, later confirming that this would be permanent. Maslen said "It was like I hadn't left. It felt a bit strange because there are new characters who I don't know – but that fits with the story".
''Strictly Come Dancing''
Maslen participated in the 2010 series of Strictly Come Dancing with professional dancer Natalie Lowe and his performances were favourably received by the judges. He was the 2nd celebrity of 2010 to score a 10 from the judges, following fellow EastEnders actress Kara Tointon scoring a 10 for her Pasodoble in week 5, the same week where Maslen scored three 10s for his Viennese Waltz. In week 7 he also received three 10s for his Jive, with Bruno stating that it was the best Jive since former EastEnders star Jill Halfpenny's in Series 2, and received just one point less. Maslen showed a natural talent for dancing, topping the leaderboard on many occasions, however was eliminated in week 11 of the series.
Awards
He was nominated in the top four for "Sexiest Male" at the British Soap Awards 2008, but was beaten by Rob James-Collier from Coronation Street. At the 2009 British Soap Awards, Maslen won in the Sexiest Male category, against fellow EastEnders actors Rob Kazinsky and John Partridge. He later went on to have a successful year at the 2010 British Soap Awards, winning both Best Actor and Sexiest Male. In 2011 and 2012, Maslen won "Sexiest Male" at the British Soap Awards.
Personal life
He is married to Estelle Maslen, who is the mother of his son Zak Alexander Maslen. The couple were together for nine years before they were married on 6 September 2008. Several of Maslen's co-stars were in attendance at his wedding, including: Samantha Womack, Rita Simons, Charlie Clements, Jo Joyner, Steve McFadden, Barbara Windsor, Patsy Palmer, Diane Parish and Perry Fenwick. He is best friends with his EastEnders co-star Samantha Womack, whom he has known since they were teenagers, and her husband Mark Womack. He is also godfather to their two children, Lily-Rose and Benjamin Womack. Benjamin is also best friends with Maslen's son Zak. Maslen is a keen carp fisherman, and has been involved in many charity events.