Sure. The only complexity is that each DFW terminal has 3 or more checkpoints, and if the gate is between two of them, "closest" may be ambiguous. Will you have a cell phone to contact him? If not, it may be safer to meet instead at a pre-designated checkpoint at the departing terminal. A few extra minutes of walking, maybe, but less chance of not finding each other.

Checkpoints listed here: http://dfwairport.com/travel/security/index.php