Donny has been posting a lot on AZ Billiards recently and having a ball. If memory serves, he also has over 200 (?) 8- and 9-Ball titles and about too many league MVPs/high averages to track.
He is exacting and thorough with his students and everyone I've sent his way appreciated his lessons and gave him great referrals.
He knows as much as anyone in the world about 8-Ball strategy and tactics and was named by Pool & Billiards Magazine to its list of "Top 20 Pool Teachers". He also has a website
where he sells cues.