EXHIBIT 10.2.1 FIRST AMENDMENT TO AMENDED AND RESTATED EMPLOYMENT AGREEMENT THIS AGREEMENT is made effective December 31, 1998, between CHESAPEAKE ENERGY CORPORATION, an Oklahoma corporation (the "Company"), and AUBREY K. McCLENDON, an individual (the...Employment Agreement • August 16th, 1999 • Chesapeake Energy Corp • Crude petroleum & natural gas
