Amplify Energy Corp. said April 3 that Ken Mariani, the Houston-based independent oil company’s president and CEO, notified the board of his planned retirement.

Following Mariani’s departure, effective April 3, Martyn Willsher, who currently serves as Amplify CFO, will serve as interim CEO of the company. Additionally, Chris Hamm will serve as lead director on behalf of the board. All of the senior management of Amplify remains in place and will report to  Willsher.

Mariani has served as president and CEO of Amplify Energy since May 2018 and led the company through its all-stock combination with Midstates Petroleum Co. Inc. in 2019. Following completion of the merger, estimated to be worth $512 million, Amplify’s portfolio included properties in Oklahoma, the Rockies, offshore California, East Texas/North Louisiana and South Texas.

During his career, Mariani also worked at EnerVest Ltd. and Energy Corp. of America as well as Conoco Inc.

In a statement commenting on the announcement, David Proman, chairman of the Amplify board, thanked Mariani for his years of service and wished him the best in retirement.