Goldman Sachs Group Inc. veteran Jason Armstrong is said to be leaving and would become Comcast Corp.'s head of investor relations, according to a report by Bloomberg.

The information of Armstrong's departure came from an anonymous, but reliable source, said Bloomberg. According to the source, Armstrong is expected to commence work at Comcast late January of next year although public pronouncements have yet to be made.

Armstrong oversaw many responsibilities professionally. He served as lead analyst for the Goldman Sachs' North American communications equity research group. In this position, he covered the pay-TV industry, which included Comcast, Dish Network Corp., and Time Warner Cable Inc.

Armstrong starts in late January, said the person, who asked not to be identified because the move hasn't been publicly announced. Comcast, based in Philadelphia, is the largest U.S. cable company.

Before joining Goldman Sachs in 2000, Armstrong was with Ernst & Young LLP.

Officials from both Goldman Sachs and Comcast declined to comment.