This one is super-easy, so please try not to Google it.
Which gentleman is being mourned here by an official release from Warner Brothers? Suffice to say that he was one of the most important people behind the scenes when it came to the cartoon characters that are shown here.
Happy quizzing, and have a nice life, folks!
Just two answers, and both arnab (Bong with…) and Ayush are correct. This is indeed Mel Blanc, who voiced most, if not all, of the famous Looney Tunes/Merry Melodies characters. In fact, there are anecdotes of Blanc slipping into a coma, and only responding when he was referred to as one of the characters he voiced! And even the response would be in character!