According to Enciclopedia della musica rock: 1954-1969 page 393. Jack Neil) or Jack Neal) is a pseudonym of Fred Neil. He would have been the writer of 'Modern Don Juan released by Buddy Holly in December 1956.
APPEARANCES +
Various
Do You Wanna Dance
2022, CD, Comp, Atomicat Records, 
,
, Rock & Roll/Rockabilly/Doo Wop/Rhythm & Blues
The TM Collective
Buddy Holly - A Tribute
2020, 21xFile, FLAC, Album, Not On Label (The TM Collective Self-released), 
,
, Power Pop
Buddy Holly & The Crickets
The First Three Albums
2009, CD, Album, Comp, Fantastic Voyage
Buddy Holly
The Very Best Of Buddy Holly
2009, CD, CD, All Media, 
,
, Rock & Roll/Rockabilly
Buddy Holly
Collector's Edition
2007
Jeffrey Evans
I've Lived A Rich Life (Live At Shangri-La Records)
2002
Buddy Holly
That'll Be The Day / Remember
2002
Buddy Holly
Forever 22
2001, 2xCD, Comp, Recall 2cd, ,
, Rock & Roll/Rockabilly
James Intveld
Somewhere Down The Road
2000
'68 Comeback
The Annex Sessions Volume Two
1996, 7", Single, Sympathy For The Record Industry, ,
, Garage Rock
The Lonesome Strangers
Lonesome Pine
1988
The Dils
Live!
1987
Buddy Holly
The Buddy Holly Story
1984, 
,
, Rock & Roll/Ballad
Buddy Holly
The Complete Buddy Holly
1981, 6x Vinyl, Box Set, ,
, Interview/Rock & Roll/Monolog/Ballad/Rockabilly
The Sports
Boys! (What Did The Detective Say?)
1978, 7", Single, Mushroom, Mushroom, ,
, Pop Rock
The Sports
Reckless
1978, ,
, New Wave
Buddy Holly
The Buddy Holly Story
1975
Buddy Holly
The Complete Buddy Holly Story
1973, Box Set, 9x Vinyl, 
,
, Rock & Roll
Buddy Holly
Die Großen Erfolge (Everlasting Hits)
1967, ,
, Rock & Roll
Buddy Holly
Modern Don Juan
1963, 7", EP, Coral
Buddy Holly
That'll Be The Day
1958
Buddy Holly
Modern Don Juan / You Are My One Desire
1956
Buddy Holly
The Buddy Holly Story: The Story Begins
LP, Comp, Mono, World Record Club
Buddy Holly & The Picks
Peggy Sue
2000, CD, Comp, P/Unofficial, Golden Giants
Buddy Holly & The Picks
Millenium Collection
1998