Edwin Porter and D.W. Griffith made significant contributions to the development of film editing. Porter directed early short films for Edison and pioneered techniques like cross-cutting and close-ups in films like "The Great Train Robbery." This helped establish editing techniques. Griffith further advanced techniques at Biograph, inventing parallel editing and developing continuity editing. He directed hundreds of films establishing conventions. Scorsese also pioneered techniques like flashbulb editing in "Raging Bull" and use of voiceover and expressionist techniques in "Taxi Driver" to portray psychological states. These directors helped establish editing as key to storytelling and engaging audiences.