<Tr> <Th> Occupation </Th> <Td> Voice actor, writer, director, comedian, storyboard artist </Td> </Tr> <Tr> <Th> Years active </Th> <Td> 1992--present </Td> </Tr> <P> Douglas Lawrence Osowski, credited as Mr. Lawrence and sometimes Doug Lawrence, is an American voice actor, writer, director, comedian, and storyboard artist . He is known for his work as a writer and actor for the animated series Rocko's Modern Life and SpongeBob SquarePants . </P> <P> Lawrence was born in East Brunswick, New Jersey . He is known for his work on the animated TV series SpongeBob SquarePants, on which he has long - running - roles as the voice of Sheldon Plankton and various recurring characters such as the Realistic Fish Head and Larry the Lobster . He physically appears as the live - action artist in "Frankendoodle". </P>

Who does the voice of plankton on spongebob squarepants