Plenty more could go on either of these lists.
Prog:
Steve Hackett
Steve Hillage
Steve Howe
Robert Fripp
Franco Mussida (Italian prog great)
Gabriel Federow and James Mac Gaw (from Magma)
Fred Frith (from avant-prog band, Henry Cow)
Jazz:
Allan Holdsworth
John McLaughlin
Mary Halvorson
Alex Machacek
Ralph Towner
Pat Metheny
Frank Gambale
Steve Morse
Terje Rypdal
Metal (progressive and technical):
Paul Marsvidal (Cynic)
Daniel Goldenlow (Pain of Salvation)
Ron Jarzombek (Spastic Ink, and Blotted Science)
Robby Bacca (The Contortionist)
Tosin Abasi (Animals as Leaders)
Acle Kahney (Tesseract)