Best known for: How I Met Your Mother

It is unusual that two people can work together harmoniously on one project, let alone for 15 years, but Bays and Thomas have made it work through thick and thin. While Late Night with David Letterman is a pretty great first credit, they followed up their time working for Letterman with some less beloved work. They readily admit that they are not terribly proud of their time on Method & Red (starring Method Man and Red Man) and Quintuplets (bet you'll never guess the premise of that one), though they insist they have tried to treasure every minute of their career, no matter how hard it might have been at points.