A combative presence with deft-play making skills, Greig has largely been deployed at full-back but his talents mean he excels also at stand-off and centre. His game management and thundering boot also made him a popular figure with fans in his stint with the Saints.
An Economics graduate from Leicester University, Tonks is eligible to play for Scotland through his Ayrshire born mother and has signed a two-year contract with the club, taking him up to the summer of 2014.
Edinburgh Rugby head coach Michael Bradley, said: "We're very happy to have secured the services of Greig [Tonks]. His age profile is very good and he's a brave, skilful, aggressive player and is a quality striker of a rugby ball.
"We play a fast and expansive brand of rugby which requires talented and intuitive players who can understand and react to playing different positions in pressured situations, so his versatility is a huge plus.
"Another stand-out characteristic is that he's an extremely driven player with a hunger for success that sits well with the ambitions of this club."
Born in Pretoria, South Africa, Tonks moved to England aged two and settled in Nottingham before being selected for the Leicester Tigers Academy and playing three seasons on loan with his home town's Championship side and the England U16, U18 and U20 sides.
As well as visits north to spend time with family and friends, Tonks has fond memories of Scotland on rugby duty, in the Nottingham side that beat Heriot's at Goldenacre in the British & Irish Cup in 2009 and at Murrayfield, where he made his Heineken Cup debut for the Saints in their win over Edinburgh en route to last season's Heineken Cup final.
Tonks said: "Edinburgh play really good, attacking style of running rugby. It's something I noticed when I played against them last season. They have the ability to take teams apart at speed and being part of that is something I'm very excited about.
"To play at Murrayfield will also be fantastic. It's an impressive international arena with incredible training facilities so this move presents a pretty awesome opportunity for me to develop as a player and be part of something special with Edinburgh."
Tonks is the latest name to join Edinburgh Rugby since South African prop WP Nel signed from Super 15 side Free State Cheetahs, while 13 other leading players, including free scoring winger Tim Visser and Scotland internationalists Greig Laidlaw, David Denton and Lee Jones, have committed to an exciting future building at Edinburgh Rugby.
Greig Tonks
Date of birth - 20 May 1989
Birthplace - Pretoria
Height - 1.85 m (6' 1")
Weight - 95kg (14st 10lb)
Position - Full-back/centre/stand-off
Edinburgh Rugby new signings: WP Nel (Free State Cheetahs), Greig Tonks (Northampton Saints), Ulises Gamboa (Aironi, to the end of the season)
Edinburgh Rugby re-signings: Sean Cox, Geoff Cross, David Denton, Gregor Hunter, Lee Jones, Greig Laidlaw, Robin Hislop, Harry Leonard, Stuart McInally, Lewis Niven, Matt Scott, Steven Turnbull, Tim Visser
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