The first voice over was from Reginald Fessenden in 1900. He did a voice over about the weather and on the radio. On Christmas he also recorded music, bible texts and Christmas messages. It started getting more popular. It would be used for the radio and cartoons. Back then, however people didn’t know who made these voices, they would think it was Walt Disney or Mel Blanc, a radio comedian.

Voice acting became more popular and grew into a business for actors. Actors in their spare time would do voice acting work. Afterwards, animated movies came out like The Lion King that turned into big successful movies. Some actors even liked to be hidden with no hair, makeup and no personal trainer. Some examples are Will Smith, Jim Carrey and many more.

https://www.buzzfeed.com/benarmson90/famous-voice-actors-roles