Lourdes Leon Guerrero resigned as board chair, president and CEO of Hagatna, Guam-based BankGuam Holding Co. and subsidiary Bank of Guam, effective Dec. 31, 2018, to prepare for her inauguration as governor of the island on Jan. 7.

The boards of both companies named Joaquin Cook interim president and CEO, effective Jan. 1.

Prior to this role, Cook was executive vice president and chief sales and service officer of BankGuam and Bank of Guam.