I own two (the only two??) Paul Siebel albums. Jack Knife Gypsy, his second album has some stellar back-up musicians including Buddy:
Paul Siebel - guitar, vocals
Clarence White - guitar
Robert Warford - guitar
Buddy Emmons - steel guitar
David Grisman - mandolin
Jim Buchanan - violin, viola
Doug Kershaw - fiddle
Billy Wolfe - bass
Bernie Leadon - guitar
Gary White - bass
Ralph Shuckett - organ, piano
Russ Kunkel - drums