Add code to <head> and </head>

Hey gang, I am using the Vincent theme on one of my sites, and from what I can tell, there is no easy way to add adsense verification code (this is different from the actual ads). It needs to be added between <head> and </head>.
Using the default theme I can add it, and google can verify, but once I switch back to the Vincent theme, the entries have been removed.

Long story short, how do I add the code between <head> and </head>

Create a theme component that adds the code to its head tag, then add that theme component to the Vincent theme:


Thank you for this. It is much appreciated.