I was driving to work on Saturday August 5th, 2017. The Excel Energy vehicle pulled up beside me and my lane was ending so I signaled to get over and slowed down and got over behind the driver. He then proceeded to make hand gestures at me while driving very slowly and putting on his brakes in front of me. This went on for a few miles. I felt threatened by him and did not feel safe driving behind him while he was acting that way. I think he was trying to teach me a lesson for pulling in behind him too closely. Maybe I did but, I do not think this is a good way to represent Excel Energy while driving in a company vehicle. The incident happened at Alameda Ave and University Blvd at around 7:30 am.