Simon Helberg stars as Howard Wolowitz, the only one of the nerds that is not a doctor.  He is an engineer at Caltech and is friends with Leonard and Sheldon and frequently is over at their apartment.  Wolowitz mostly goes by his last name and still lives with his mother.

Most jokes with Wolowitz revolve around his failed attempts at womanizing, though he was given a girlfriend, Bernadette, in season three.

Howard Wolowitz Quotes

Wolowitz: Listen, you have to come to Shabbas dinner at my house sometime.
Bernadette: Why?
Wolowitz: A Catholic girl like you, wearing big cross like that, might just give my mother that big brain aneurysm I've been hoping for.
Bernadette: Only if you come to Sunday dinner at my house wearing a yamaka
Wolowitz: It's a date

Raj: The Wolowitz coefficient?
Wolowitz: Neediness times dress size squared

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TBBT Quotes

Oh, Bernadette, please play my clarinet.

Raj's poem

Sheldon: I'll have a diet Coke.
Penny: Can you please order a cocktail? I need to practice mixing drinks.
Sheldon: Fine... I'll have a virgin Cuba Libre.
Penny: That's... rum and Coke without the rum.
Sheldon: Yes, and would you make it diet?