J.T. Forbes is a long-time friend of Vincent Keller. He is also a scientist and helped Vincent over the years as he tried to restrain his beast powers and discover a cure. He's sarcastic, and funny, but would do anything to help those he holds dear. 

J.T. Forbes Quotes

Tess: It's just, I dread this holiday so much. It's the part where my family grills me about my single status and there are no gifts to offset the humiliation.
J.T.: Then don't go. Tell them you're working, which you are. We can boycott the holidays together.
Tess: Just you and me?
J.T.: And some beer and some pizza and some creepy guy's voice.
Tess: Can we start drinking now?
J.T.: Absolutely. This is going to be the best Thanksgiving ever! Non-Thanksgiving.

Cat: Have you heard from Vincent yet?
J.T.: I'll just leave the damned door open from now on.

Beauty and the Beast Quotes

Vargas:This is where he lives? A chemical plant?
Cat: He's a researcher, maybe he works from home?
Vargas: Or maybe it's a meth lab.
Cat: Just my type.

Everyone told me it was just a coyote or a bear. This thing I thought I had seen was just a result of my concussion or post traumatic stress. No, the men who killed my mother were beasts. I believed them. Until now.

Cat