If you've been tasked with organizing an important celebratory event for your business, then one of the most important decisions you have to make is choosing the right keynote speaker. The keynote address is what sets the whole tone for the celebration to come, so it's important that the speaker is perfect.

Now that The Office has gained infamy in America, Ricky Gervais, the brains behind the show's original, British incarnation, has become a household name.

Finding a humorous keynote speaker who is also informative can be a difficult task. There are certainly not many people around who can be humorous and informative at the same time. The ability to be entertaining and make the listeners laugh, while also managing to get a point across as is the case with advertising, is certainly a rare gift and something that prove very useful.

Dane Cook has captured the attention of audiences through stand-up comedy for the past 15 years.

Russell Peters has been doing stand up for 20 years. The comedian had a recurring role in the Canadian sitcom Lord Have Mercy.

The Dallas Morning News describes Dunham as a rare and exquisite performer.

Yet more brothers who have made a success of football.

Lisa Lampanelli has been described as a cross between Archie Bunker and Don Rickles.

Emmy award winning Chicago native Kathy Griffin is known for her rapid - fire wit.

One of the most successful and influential comedians of his time, Jerry Seinfeld was known for his brilliant skits of poking fun at everyday life.