London Broncos owner David Hughes has stepped down as chairman to make way for a major new investment in the club.
Ian Lenagan, head of the Sports Cafe chain, has taken over as chairman and become joint owner along with Hughes.
The move will safeguard the future of the Broncos, who were re-formed four months ago after going into liquidation with debts estimated at £3m.
"This is simply fantastic news for the club," said London Broncos chief executive Nic Cartwright.
"For David to attract a man of Ian's pedigree, enthusiasm and standing, says much about our club and about our former chairman. This will allow us to take even further steps forward as a club."
Hughes, who bought the club from Richard Branson in 2001, said: "We welcome Ian to the club and I am very excited about working with him to take the club to the next level."
Lenagan, who was born and brought up in Wigan, said: "The time is right for me to get highly involved in rugby league.
"I can see a big future for both the Broncos and for the game here in London.
"I know that a lot of hard work lies ahead. I also know that the Broncos have a great team and group of players, a hard-working and talented set of off-pitch staff, and some of the best fans in the country.
"This is a club that has a great feel about it, one that it will be an honour to lead."
Lenagan is also a successful theatre producer with more than 30 productions to his name both on tour and in the West End, his most recent success being the co-production of One Flew Over the Cuckoo's Nest with Christian Slater.
The Broncos are also set to move grounds yet again at the end of the season, leaving Griffin Park to return to the Stoop in a new cross-code partnership with Harlequins.