Gregory Everett Proops is an American actor, stand-up comedian and television host. He is widely known for his work on the UK and US versions of Whose Line Is It Anyway?. He has also voiced the titular character on the US version of Bob the Builder: Project: Build It in series 10 to 14.

Bob the Builder, also known simply as Bob, is the titular protagonist of the British animated programme of the same name. He is a general contractor with his own construction yard in Bobsville, Sunflower Valley, Fixham Harbour, or Spring City depending on the programme.