Leonardo DiCaprio is set to speak at the State Department’s “Our Ocean” conference Tuesday morning.

Secretary of State John Kerry will introduce DiCaprio, who will speak immediately after a video appearance by President Obama.

“I’m pleased that Leo DiCaprio is lending his powerful voice to our call to action to work together to protect the world’s ocean,” said Secretary Kerry.

Kerry invited the “Wolf of Wall Street” star to the conference because of the dedication that he and his Leonardo DiCaprio Foundation have demonstrated in efforts to protects the world’s oceans and the environment. In February, the DiCaprio Foundation awarded the advocacy group Oceana a $3 million grant to protect the ocean habitat and vital marine species.

The two-day conference will be attended by government ministers, scientists and other advocates.

On Monday morning, Kerry announced that his own participation may be limited as he attends to the ongoing turmoil in Iraq.

More information on the conference can be found here.