Is it true that GERD puts people at increased risk for barrett's?

Yes. Gerd or acid reflux causes damage to the lining of your esophagus. Your esophagus tries to protect itself, by attempting to look like the stomach or intestines. It accomplishes this by changing its lining, or developing barrett's metaplasia (meta meaning to change).
Barrett's. This is a change in the esophagus in response to longstanding reflux. It is a precancerous change which requires frequent surveillance EGDs to make sure cancer is not developing. If Barrett's is found, the abnormal areas can be ablated so that they do not progress to cancer.