According to the
May 19, 1979 edition of the San Francisco Examiner, Stansell umpired college games in the south.
Retrosheet lists his name as “B. Jack Stansell." He only worked 1 National League game, in Atlanta.
I located a
death write-up for a B. Jack Stansell from 2019, and then found a full
obituary from Dec. 17, 2019 for him (without the "B."), revealing he lived in Georgia and umpired high school and college baseball, and ushered for the Braves.