The first part of training should be wait at the door. It is a life saving command, in this case for the dog and the person he chased. These dogs give themselves jobs to do if not taught different. Next on the training list would be to get this dog used to skateboards, bikes, joggers, anything with movement. Teach him to leave it and/or ignore it.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD