Cogan appeared on stage in The Bohemian Girl. She later went into movies. Her screen credits number five. She had roles in The Shell Game (1918), The Cross Bearer (1918), The Great Victory, Wilson or the Kaiser, the Fall of the Hohenzollerns (1919), The Woman of Lies (1919), and The Shadow of Rosalie Byrnes (1920).
Fanny Hay Cogan died in Lenox Hospital in New York City in 1929. She was 64 years old. Cogan was the widow of scenario writer James P. Cogan.
- The New York Times, Mrs. Fanny Hay Cogan, Actress, May 19, 1929, Page 27.