#3 The Know-It-All
The one that's always right, even when they're wrong. The one that's been here the longest, and knows everything that needs to be known about your profession. If you've been to Tenerife, they've been to Elevenerife.
How to Handle:
If you're going into a meeting, go in prepared and take measures to ensure there's minimal reason for the Know-It-All to argue. Compile notes and figures to back up your points and if the Know-It-All still tried to challenge you, just sit back, nod and smile. They hate that!