Boeing CEO Dennis Muilenburg is stepping down. Greg Smith, the company’s chief financial officer, will serve as an interim chief financial officer.

“The company announces that Dennis A. Muilenburg has resigned from his position as CEO and Board Director, effective immediately,” Boeing said in a statement.

The company’s release noted that the change of chief Executive was necessary to ensure that Boeing still enjoys trust and “moves forward.”

The company also said that the current Chairman of the Board of Directors, David Calhoun, was appointed Chief Executive officer. He will begin his duties on January 13, 2020.