I kept searching nevertheless ... and this is my Christmas gift -- I got lucky.
I saw a YouTube post by his grandson -- and your ever so daring Raggedy sent him a message. The young men was kind enough to answer me and even put me in contact with his father, Jimmy's son. I couldn't believe it!
Jimmy's son agreed to my posting the short biography he's sent me. And I will post it today -- the day before Christmas eve.
Sadly enough, Jimmy Jackson is no longer with us. May his soul rest in peace. His voice sure brought much joy into my life.
Many thanks to his son and grandson for their generosity!
Here is what his son told me: