Harry was also D. W. Griffith's partner at Reliance-Majestic Studios; both parted with the Mutual Film Corporation in the wake of The Birth of a Nation's unexpected success that year.

[1] Triangle was envisioned as a prestige studio based on the producing abilities of filmmakers D. W. Griffith, Thomas Ince and Mack Sennett.

[4] In June 1917, Thomas H. Ince and Mack Sennett left the company and sold their remaining interests.

[5] In 1917, Triangle's distribution network of film exchanges were sold off to the W.W. Hodkinson company for $600,000[6] (equivalent to $14,000,000 in 2023).

[10] Most films were made on the West Coast, but some of Triangle's production took place in Fort Lee, New Jersey.