Drummond started his career in 1942. He is most well known for being the Brazilian voice of Scooby-Doo in all the character's dubbed appearances, since the original series up to the recent live action movies, including even the character's cameos in other programs such as Harvey Birdman: Attorney at Law. Other characters voiced by him include, but are certainly not limited to; Popeye, Owl from Winnie the Pooh, Professor Calculus from The Adventures of Tintin, Q from James Bond movies, Odo from Star Trek: Deep Space Nine and several others.