Career
UUNET was purchased by MFS, later taken over by WorldCom, which eventually bought Microwave Communications Incorporated. He later became WorldCom"s Chief Operations Officer. Sidgmore worked to revive WorldCom after disgraced Chief Executive Officer Bernard Ebbers left. Sidgmore was instrumental in beginning to turn around the failed company, revealing to federal investigators an $11 billion accounting fraud, left over from Ebbers" management of the company.
John Sidgmore died suddenly on December 11, 2003 at the age of 52 from kidney failure.