[1] He directed several Thanhouser films including the production company's first two-reeler,[2] Romeo and Juliet.

In 1910 and 1911 he filmed adaptations of a couple William Shakespeare plays.

[6] In 1915 he filmed a version of McTeague in Death Valley[7] released as Life's Whirlpool.

[8] William E. Hamilton was an assistant director to O'Neil.

Media related to Barry O'Neil at Wikimedia Commons