Jamieson has moved to the organisation that represents a whole host of leading players, including major winners Darren Clarke, Charl Schwartzel and Louis Oosthuizen as well as former world No 1 Lee Westwood, after coming to the end of his contract with the Champions of Golf.
“It is great to join such a successful stable and I am very excited for the year ahead,” said Jamieson, who made his European Tour breakthrough in the Nelson Mandela Championship at the end of 2012 and has played in the last two Seve Trophies.
Coltart was represented by ISM when he played in the 1999 Ryder Cup and, since retiring as a Tour player, has been scouting for Chandler at amateur level.
The company snapped up Michael Stewart after the 2011 Walker Cup on the back of his eye-catching exploits in the amateur ranks, but the Ayrshireman is no longer on the books following a sluggish start to his professional career.
Jamieson, who had a decent amateur career himself – the Cathkin Braes player won the Scottish Boys’ Stroke-Play Championship in 2001 – studied business and marketing at Augusta State before cutting his pro teeth on the PGA EuroPro Tour.
He then used the Challenge Tour as a stepping stone on to the main circuit, where he has improved in each of the last three seasons by finishing 59th, 53rd and 31st in the Race to Dubai.
“I am delighted to welcome Scott to the company,” said Chandler, ISM’s chief executive officer. “He is a superb addition to our very talented group of golfers.”
Leciestershire-based Champions of Golf still has Marc Warren on its books and recently signed up two rising Scottish stars, Scott Henry and Neil Fenwick.
Henry’s rookie season on the European Tour last year was illuminated by finishing fourth in the Johnnie Walker Championship at Gleneagles but he came up agonisingly short of retaining his card.
It means he’ll have to settle for the occasional European Tour appearance this season so is likely to focus instead on the Challenge Tour, where he will be joined for the first time by Fenwick after the former Dunbar assistant earned a category for that through the Qualifying School.