Dr Carl Moeller has announced he is stepping down as president and chief executive of Open Doors USA.

He is leaving the organisation, which supports persecuted Christians worldwide, after nine years at the helm to take on a new role as president at Sequoia Global Resources.

"It has been a joy and privilege working with my persecuted brothers and sisters around the world over the past nine years," said Moeller.

"They have taught me so much about being faithful in the midst of suffering. My prayer is that more Christians in the West become informed about persecution and unite as one in supporting persecuted believers.

"It also has been my privilege to work with so many dedicated people at Open Doors. Many of them literally risk their lives to bring Bibles, conduct seminars and bring hope and comfort to marginalised believers."

Open Doors USA board member Steve Ridgway will take over as interim chief executive officer until a permanent appointment has been made.

Ridgway is executive director of Northwest Network Foundation, in Puyallup, Washington, a non-profit organisation that mentors existing and emerging leaders. Ridgway has been an Open Doors USA board member for nine years.

"For the past nine years Carl Moeller has been a voice for Christ followers living in the midst of persecution," said Ridgway. "Through the artistry of his vision and voice, he has clearly and vividly painted a picture of what the church looks like where following Jesus is both difficult and deadly. Carl's presence will be missed, but his vision will remain."

Ridgway added: "The future of Open Doors USA will be to move forward in filling the CEO's position during this transition and to continue to support our persecuted brothers and sisters in Christ throughout the world."

Open Doors International chief executive Jeff Taylor paid tribute to Moeller.

"Carl's passion for persecuted Christians was evident in his nine years as president of Open Doors USA," he said.

"He desperately wanted the American church to be more aware of the persecution of Christians, but he also wanted the church to mobilise on behalf of our brothers and sisters suffering for their faith in Jesus Christ. I know Carl will take that same passion and desire to his new ministry role."