On March 3, 2021, Evan Jones, a director of OpGen, Inc. (the Company) since 2010, notified the Chairman of the Board of Directors of the Company that, for personal reasons, he would not stand for re-election at the 2021 Annual Meeting of Stockholders of the Company (the 2021 Annual Meeting). Mr. Jones' resignation was not the result of any disagreement with the Company or its management with respect to any matter relating to the Company's operations, policies or practices.