MARIANA TOSCA starred in Christmas in the Clouds opposite Graham Greene, M. Emmet Walsh and Wes Studi. Her other film credits include: I Knew a Girl Named Hollywood, War, The Rites of Spring, So I Married an Axe Murderer, John Carpenter's Village of the Damned and The Doors.

Following up Equine Destiny, an award winning documentary about the mounting issues facing America's horses, that she co-produced and in which she stars, Mariana is currently co-producing Journey to Royal, a documentary which tells the story of Lt. Royal A. Stratton, a United States Air Force rescue pilot who died heroically saving the lives of 9 airmen in the South Pacific during World War II.

For decades, Mariana has been at the forefront of social advocacy and founded the Los Angeles Homeless Coalition, offering shelter, relief and skills training to the homeless population there.  In 2012, she will be producing and starring in Earth Echoes, a theatrical production that will run in Los Angeles as a benefit for several social advocacy nonprofit organizations.

She sits on the Board of TheTenDollarClub.org, a nonprofit organization which funds poverty alleviation projects around the world. To date, they have undertaken 85 projects in 64 countries, providing lifechanging services for thousands of people in underdeveloped countries.

Tosca studied Acting at the American Conservatory Theatre and has served on the Board of Directors of the Alliance Repertory Company and Theatre East and is a member of Mensa International.   Her theatre credits include: Medea/Mother in The Crossover, Mary Magdalene in Jesus Christ Superstar, Lady Torrance in Orpheus Descending, Medea in Medea, Marquise de Merteuil in Les Liaisons Dangereuse, Paulina in Death and the Maiden, Jessie in 'night Mother, the Baker's Wife in Into the Woods, and Penny in Highest.

She volunteers teaching Drama, as well as Voice & Movement, at the Academy of Music for the Blind, where she also serves as an Advisory Board member.   Additionally, she sits on the Advisory Board of ElephantVoices, DreamCatcher Wild Horse & Burro Sanctuary, Born Free USA, the National Equine Resource Network and along with Lily Tomlin, Olympia Dukakis, Jorja Fox and Wolfgang Petersen, she serves on the Honorary Board of Voice for the Animals Foundation.   She also proudly serves alongside Dr. Jane Goodall on the Advisory Council of Save the Chimps, the world's largest chimpanzee sanctuary which is home to hundreds of chimpanzees retired from the NASA space program, bio-medical research and the entertainment & pet trades.