Saw John Abercrombie at Yoshi's earlier this week and was very impressed by his violinist Mark Feldman. Here is his website:
http://www.markfeldmanviolin.com/enter.htm
Too
bad he didn't mention what violin he plays.
His myspace page has
some audio and video as well:
http://www.myspace.com/markfeldmanviolin
Definitely
has classical background. Seems like that's the norm for jazz
violinists.
On the other hand, jazz guitarist with classical
background seems to be minority. My guitar teacher, Jimmy Bruno, does
have classical training. He got some ideas about practicing from
Wohlfahrt!