By Jay F. Marks, Business WriterAmerican Energy Partners LP on Monday announced the hiring of a former Chesapeake Energy Corp. executive as chief financial officer for two of its affiliates. Jennifer M. Grigsby, who spent 19 years at Chesapeake, will serve as chief financial officer for American Energy-Woodford LLC and American Energy-Mineral Holdings LLC. Grigsby most recently was Chesapeake’s senior vice president of corporate and strategic planning.