After completing the short film Little Boy Blue released in May 1912, her stock company traveled to Portland, Maine, to film other projects.

[2] As Mary Warren, she was an actress based in Hollywood[3][4] who appeared in two dozen silent films between 1918 and 1924.

In 1916, Mary Warren married character actor Lee Phelps.

[6][7] Lee Phelps, 59, died on March 19, 1953, in Los Angeles, California.

Mary Warren, 62, died on August 8, 1956, in Los Angeles.