Pitching trainers in the DC area?

Does anyone have any names of pitching instructors in the DC area?
We have some small instructional facilities around but I am looking for someone that is specialized in working with pitchers.

Maybe you can find an instructor close enough here
http://www.nationalpitching.net/certified.asp?
.

Most of the facilities in the NOVA area list their instructors on the websites. I know that Virginia Baseball Club does.