Rhyu was CFO and chief administrative officer at Match.com. He also has been senior vice president at Dow Jones.
Edelson, a senior vice president who has been at the company since 2005, will succeed CFO Peter Keegan when the latter retires in May.
Towse also has been tapped senior vice president. He has been CFO at Vette and at Fairchild Semiconductor.
Christl also serves as senior vice president. He has been CFO at divisions of Warnaco Group and a unit of Technicolor.
Easter has been CFO at SEH Offshore Ventures and CEO at Seahawk Drilling.
Collier was the company's chief accounting officer.