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.
Besides his celebrated work as a voice actor, Drummond has also worked as an actor in Brazilian television, including participating in the hit program Zorra Total. He is perhaps most well known for playing the role of Seu Peru in the show Escolinha do Professor Raimundo.