The Professional

 is a perk in Fallout: New Vegas.

Effects
Up close and personal, that's how you like it. Your sneak attack criticals with pistols, revolvers, and submachine guns, whether guns or energy weapons, all inflict an additional 20 percent damage.

Behind the Scenes
The Professional is a reference to the french movie Léon, also known as 'The Professional' and 'Léon: The Professional'. The plant next to the Vault Boy is a reference to the movie, as well as the rounded glasses and the hat.