Plans are coming together for a biopic of  Mother Teresa , with  Keir Pearson tapped to write a the screenplay for  I Thirst . Tony Krantz ‘s Flame Ventures is producing the project with Origin Entertainment and The Mother Teresa Center. Pearson most recently co-wrote another biopic, the Diego Luna-directed  Cesar Chavez: An American Hero  starring Michael Pena as the California labor leader and civil rights activist. Lionsgate releases it on March 28. “Keir’s presentation and his Oscar-nominated script of  Hotel Rwanda  and his sensitive script for  Chavez   made him the perfect choice,” said Krantz in announcing the project, which he will produce. “ I Thirst  is the first and only authorized film about the life of Mother Teresa on the big screen. We couldn’t be more excited for this movie about a woman who stood for total commitment, faith, charity and love.”