Urbie Green and Delfeayo Marsalis.
Green, now 88 and retired from music, was known for his technical prowess, both as a soloist and bandleader and as a sideman with the big bands of Woody Herman, Gene Krupa and others, while Marsalis (pictured) is part of the famous New Orleans family that includes his dad, pianist Ellis Marsalis, and brothers Wynton, Branford and Jason.
Also worth a look (though we can't seem to get the embedded version to work on this page) is the episode about jazz trombone produced for the "Building Blocks of Jazz" segment of HEC-TV's program I Love Jazz.
Featuring St. Louis trombonist, bandleader and educator Dave Dickey with Jazz St. Louis education director Phil Dunlap on piano, the video covers "the evolution of the trombone style, from New Orleans to BeBop" and can be seen online here.
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