For starters, remove anything he could consider food, i. e, the birdseed, and any source of water.

I think they like everything! Check with your Wildlife enforcement agency (here we have Fish & Wildlife, a state agency) to see what they recommend.

Take a look at this information. I am an animal control officer and we use this resource a lot for help with other animals. Hope this helps.

Exclusion is the key.

Here is a link that might be useful: Bear Exclusion Information