Background
Cossar was born in London, England.
Cossar was born in London, England.
He appeared in 146 films between 1914 and 1929. Walter was in the Royal Marines between 1835 and 1863. In 1865 the family travelled to Canada and thence to Chicago, Illinois in the United States of America where John"s older brother Walter Lyster Cossar later became City Editor of the Chicago Evening Journal.
In 1896, John married Fanny Cohen in Chicago.
Fanny was also an actress and the 1930 census of Los Angeles shows them living with two children, Phyllis and Raymond. He died in Hollywood, California, in 1935.