As you can see by Milt's biography, he is the Principal Trombonist with the National Symphony Orchestra in Washington, DC.

The Principal players of that orchestra also perform as a Brass Quintet. The members of the quintet include:

Steven Hendrickson and Adel Sanchez (trumpets), Martin Hackleman
(horn), Milton Stevens (trombone), David Bragunier (tuba).

The NSO's website can be found HERE.

The John F. Kennedy Center for the Performing Arts
2700 F Street, NW
Washington, DC 20566
Tickets and Information: 800-444-1324 or 202-467-4600
Administrative Offices: 202-416-8000

On the NSO's site, be sure to visit the video clip of Milt! (You may need to first open RealPlayer, then paste the URL into the Player)