Final answer:
John J. Graham first created the NBC peacock logo in 1956 to promote NBC's color broadcasting, and the most familiar version was introduced in 1962.
Step-by-step explanation:
The iconic NBC peacock logo was first created in 1956 by John J. Graham. It initially consisted of eleven feathers to represent the eleven affiliates NBC had at the time, and it was designed to help promote the company's innovations in color broadcasting. However, the peacock that most are familiar with today was introduced in 1962 to prominently feature the use of color television. The peacock has undergone several redesigns since, but it remains an enduring symbol of the NBC television network.