Middlefield Banc Corp. has said that Ronald L. Zimmerly, Jr. has been appointed as chief executive officer. Zimmerly replaces James R. Heslop, II.

Zimmerly, currently president and director of Middlefield Banc Corp. and The Middlefield Banking Company, will take charge as chief executive officer of both entities on January 1, 2024, upon Heslop's retirement. Heslop will resign from the Middlefield Banc Corp.

board of directors on December 31, 2023. The company said its board has taken action to reduce its size from 13 to 12 effective, December 31, 2023. Zimmerly, who joined Middlefield as president following the acquisition of Liberty Bancshares Inc. on December 1, 2022, was previously the president and chief executive officer of Liberty Bancshares Inc. from 2010 to 2022.