Gretchen H. Watkins, currently vice president of international production operations, has been appointed vice president of North America production operations for Marathon Oil.

Watkins will succeed Jim Bowzer who has elected to retire, effective Sept. 1, after 30 years of service with Marathon Oil. Mitch Little, currently resident manager of Marathon’s Norway business, has been named vice president of international production operations. Watkins’ and Little’s appointments are effective Sept. 1.

Watkins and Little will be located in Houston and report to Roberts.