Bastiaan Johan Christiaan "Bas Jan" Ader (1942-1975) was a Dutch conceptual artist, performance artist, photographer and filmmaker. He lived in Los Angeles for the last 10 years of his life. Ader's work was in many instances presented as photographs and film of his performances. He also made performative installations, including Please Don't Leave Me (1969). Ader was lost at sea in 1975 between Cape Cod, Massachusetts, United States and Ireland, when he set out to sea from Cape Cod in a small sailing boat as part of an attempt to cross the Atlantic Ocean. His empty boat eventually washed up on the coast of Ireland.